—Did you receive the letter the next day?
—No. Somehow, it was three weeks ________ I received it.
A．sinceB．beforeC．thatD．when
B

試題分析：考察特殊句式。固定句式：It be 一段時間 before…一段時間以后某事才發(fā)生；如果before后面使用一般現(xiàn)在時，前面的主語使用將來時；如果before后面使用一般過去時，前面也使用一般過去時；句義：—你第二天收到那封信了嗎？—沒有。不知道為什么，我三個星期以后才收到。故B正確。
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