Were you sure they___there thirty minutes ___?A.will be;laterB.have been;beforeC.had been;agoD.had been;before

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Were you sure they___there thirty minutes ___?A.will be;laterB.have been;beforeC.had been;agoD.had been;before
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Were you sure they___there thirty minutes ___?A.will be;laterB.have been;beforeC.had been;agoD.had been;before
Were you sure they___there thirty minutes ___?
A.will be;later
B.have been;before
C.had been;ago
D.had been;before

Were you sure they___there thirty minutes ___?A.will be;laterB.have been;beforeC.had been;agoD.had been;before
我选C.用Were提问you,说明,是过去的事情了.They的动作需要用过去完成时,所以排除A B.before这个词后面必须有具体的时间紧跟其后,所以句子最后一个词是ago.

官方图呼呼呼呼会热活动费代表大会个运动员有业务员好的地方有多高有更好的巨大环境的呢和程度上买的那些客户消费行业