but,___the archaeologists have been unalbe

.
She is the only one of those women archaeologists who ________ chosen to go to Loulan.

A．has

B．has been

C．have been

D．had been

D
LONDON—Archaeologists have discovered a smaller prehistoric(史前) site near Britain’s famous circle of standing stones at Stonehenge.
Researchers have named the site “Bluehenge” after the color of the 27 Welsh stones that were laid to make up a path. The stones have disappeared, but the path of holes remains.
The new circle, unearthed over the summer by researchers from Sheffield University, represents an important find, researchers said Saturday. The site is about a mile away from Stonehenge.
Bluehenge, about 80 miles southwest of London, is believed to date back to about the time Stonehenge was built, about 5,000 years ago.
Mike Parker Pearson of Sheffield University said he believed the path and stonehenge itself were linked to rituals(仪式) of life and death.
Mike Parker suggested that the ancient funerary rituals began at a different circle site known as “Wood-henge”, which represented the world of the living. The bodies of the dead were then brought down the River Avon to Bluehenge, which represented death, and were finally carried along a ceremonial route known as the Avenue to Stonehenge.
Bournemouth University Professor Tim Darvill, an expert on Stonehenge, told Britain’s Dail Mail that Bluehenge “adds to the richness” of the ancient site’s story.
“This henge is very important because it forms part of the picture of ceremonial monuments in the area and puts Stonehenge into context,” Darvill was quoted(引述) as saying. “It’s no longer Stonehenge standing alone, but it has to be seen in context with the landscape.”
53．How many henges are mentioned in this passage?
A．Two B．Three C．Four D．Five
54．Who believed the Stonehenge is related to ancient ritual of death?
A．Archaeologists from London B．Welsh researchers
C．Mike Parker Pearson D．Professor Tim Darvill
55．What does the underlined sentence “It’s no longer Stonehenge standing alone, but it has to be seen in context with the landscape.” in the last paragraph mean?
A．Stonehenge has noting to do with Bluehenge
B．Woodhenge represented the world of living in ancient times.
C．Bluehenge represented death
D．Stonehenge, Woodhenge and Bluehenge should be studied together
56．From the passage we can learn that ______.
A．researchers have named the site “Bluehenge,” because they have found blue huge stones there
B．funerary rituals were carried out along the path starting from Woodhenge, River Avon to Bluehenge, finally Stonehenge.
C．Bluehenge is 1 mile away from London
D．Bluehenge dates back to 2000 BC