2019年mpacc考试英语真题——连词441

{01}It will be at least three weeks________ he recovers from his illness and returns to work.

A.before

B.when

C.since

D.after

解析：考查固定句型。It be 一段时间before从句，意为：一段时间以后某事才发生。句意：至少3个星期以后他才从疾病中恢复重新回到工作岗位上。
本题选A。

{02}Dr Yuan Longping grows ________ is called super hybrid rice, _________ has a high output.

A.what; which

B.that; what

C.that; which

D.what; what

解析：本题考查定语从句和宾语从句。第一个空是宾语从句，引导词作主语用what；第二空是非限制性定语从句，引导词代表super hybrid rice，在从句中作主语，用which。
本题选A。