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【题目】No one knows how the huge rocks _______ and _______ without our modern machines eight hundred years ago.
A.were cut; moved
B.were cut; move
C.are cut; moving
D.are cut; moved

【答案】D
【解析】根据时间状语可知从句中叙述的为过去发生的事情, cut和moved为并列谓语所以用过去时态,故选D。

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