【題目】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】根據(jù)時(shí)間狀語(yǔ)可知從句中敘述的為過(guò)去發(fā)生的事情, cut和moved為并列謂語(yǔ)所以用過(guò)去時(shí)態(tài),故選D。

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