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He was told that it would be at least three more months______he could recover and return to work.
A.whenB.before
C.sinceD.that
B
before引导时间状语从句,意为“在……之前”,表示他康复重返工作还至少三个月时间。when引导时间状语从句,意为“当……的时候”。since引导时间状语从句,意为“自从”,表示从某个时候一直延续到现在,常与现在完成时连用。that用于名词性从句或定语从句。
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