He was told that it would be at least three more months he could recover and ret

He was told that it would be at least three more months ______he could recover and return to work.

A.when                                                           B.before

C.since                                                            D.that

试题答案

B

解析:

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。