-- Does a UFO really exist? -- No one cann be sure. Maybe it

暗夜vaa2022-10-04 11:39:541条回答

-- Does a UFO really exist? -- No one cann be sure. Maybe it ___ a mystery forever.
A. is remained B. will remain
C. has remained D. remains

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xingxingguoo 共回答了16个问题 | 采纳率93.8%: -- Does a UFO really exist?-- No one cann be sure.Maybe it ___ a mystery forever
A.is remained B.will remain
C.has remained D.remains
选项是B
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