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

问题补充：

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

答案：

A. when

(答案→)B. before

C. since

D. that

解析：考查时间状语从句。句意：据说，至少要过三个多月，他才能恢复过来并返回工作上。A当；B在......之前；C自从；that无意义。It will be+时间+before...“在......之前，还要过多久”，是固定句型。故选B。