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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
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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