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+狀語位于句首要采用倒裝，又因?yàn)閿⑹鲞^去的事情所以用一般過去時(shí)態(tài)。句意：只有在花費(fèi)數(shù)晚上的時(shí)間計(jì)算這道題之后他才懷疑是否問題出錯(cuò)了。
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