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

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：考查固定结构。it would be+一段时间+ before。。。要过多长时间才。。。句意:他被告知要过至少三个多月他才能恢复回去上班。所以选B。