2019年mpacc考试英语真题——连词440

{01}Scientists say it may be five years ______ it is possible to test this medicine on human patients．

A.since

B.until

C.before

D.when

解析：本题考查连词。句意：科学家说可能还要五六年才可能将此药试验在人身上。before引导时间状语从句, 表示 “过了……就”。
本题选C。

{02}I was about to give up the project ______ it hit me_____ I could work with my roommates. That’s to say, I can turn to them for help.

A.that; whether

B.that; when

C.when; how

D.when; that

解析：考查固定句型和形式主语句。第一空是固定句型Be about to do sth when…正要做某事在这时…;第二空是形式主语句，it是形式主语，that I could work with my roommates是真正的主语。
本题选D。