2019年mpa考试英语真题——连词298

{01}Most parents encourage their children to take an active part in social events, _____ those events do not
interfere with their studies.
A.concerning
B.until
C.unless
D.provided
解析：
本题选D。

{02}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：
本题选C。