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【题目】Time passed quickly and three years went by ______ we knew it. How I regret the time I wasted!

A. afterB. tillC. beforeD. when

【答案】C

【解析】

考查连词辨析。句意:时间过得很快,在我们知道这件事以前已经有三年过去了。我是多么后悔我浪费了时间啊!A. after在……之后;B. till直到;C. before在……之前;D. when当……时候。空前说三年已经过去了,说明这个时间发生在we knew it(我们知道)之前。故选C

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