【題目】--Did you receive the letter the next day?

--No, somehow, it was three weeks ______ I received it.

A. since B. when C. that D. before

【答案】D

【解析】

試題分析：句意：第二天你收到信了嗎？沒有，不知道為什么，三周后我才收到信。固定結(jié)構(gòu)It+be+時間段+before.....表示“要..(時間段)..才.....”，故選C.

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