—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(shí)間 before…一段時(shí)間以后某事才發(fā)生；如果before后面使用一般現(xiàn)在時(shí)，前面的主語(yǔ)使用將來(lái)時(shí)；如果before后面使用一般過(guò)去時(shí)，前面也使用一般過(guò)去時(shí)；句義：—你第二天收到那封信了嗎？—沒(méi)有。不知道為什么，我三個(gè)星期以后才收到。故B正確。
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