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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