So powerul ___ in Lushan county,Sichuan province that

So powerful ___ in Lushan county,Sichuan province that water and electricity in the area were cut off.
A.was the quake B.the qake was C.did the quake D.the quake did
答案A.这是so...that 句型
so 短语位于句首时 主句要部分倒装 ,即 用疑问句语序.
正常语序是 the quake was so powerful in Lushan county,Sichuan province that water and electricity in the area were cut off
2—Sophie,do you still remember when we visited the museum?
—Sorry,I can't remember clearly now,but ___ sometime last year?
这道题答案为C.
这是表示对过去的 事情的推测.
其它选项 都没有此意 ,故错.

第一题：由于句子由so加形容词powerful开头，所以后面要倒装，所以选A
第二题：could have done表示过去做过某事，这里的意思是“它可能是去年某个时间发生的吗？”而should have done 表示本应该做某事而没做