how long ___?

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how long ___?
A.you suppose did it last
B.do you suppose it lasted
C.did you suppose it last
D.you suppose it lasted
我选的是c,
考查点是什么嗯？

如果是C,last应该是lasted,因为suppose后面接的是一个省略了that的从句,是一个完整的句子,it是单数,所以应该是lasted.
再问：考查点是什么嗯？
再答：这个应该是前后时态的一致性吧，如果是C，变成陈述句，回答应该是I supposed it lasted......
答案是B，变成陈述句是I suppose it lasted......，I suppose是一般现在时，it lasted表示的是已经持续了多久的意思，是过去时，翻译过来是我猜它持续了（多久），持续了的是已经结束的事物，所以是过去时

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