2019年mpa考试英语真题——连词321

{01}The A(H1N1) flu virus will infect a third of the world"s Population ____ it continues to spread at this rate,
some scientists warned.
A.when
B.if
C.though
D.as
解析：
本题选B。

{02}With some technical problems to be solved, it may be a while _____ the system is put into use.
A.when
B.after
C.since
D.before
解析：
本题选D。