Only after spending several nights working on the math problem to wonder whether the problem was wro

题目简介

Only after spending several nights working on the math problem to wonder whether the problem was wro

题目详情

Only after spending several nights working on the math problem         to wonder whether the problem was wrongly set.
A.had he begunB.he beganC.did he beginD.began he
题型:单选题难度:偏易来源:不详

答案

C
only+状语位于句首要采用倒装,又因为叙述过去的事情所以用一般过去时态。句意:只有在花费数晚上的时间计算这道题之后他才怀疑是否问题出错了。

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