2019年mpa考试英语真题——连词312

{01}Scientists say it may be five or ten years ______ it is possible to test this medicine on human patients.
A.since
B.when
C.after
D.before
解析：
本题选D。

{02}— The 2011 College Entrance Examination has just been over!
— Yes, it will be about two years _____we attend it.
[      ]
A.until
B.before
C.after
D.since
解析：
本题选B。