2019年mpa考试英语真题——介词和介词短语134

{01}I was about to go to bed ________ suddenly someone knocked at the door．
A.while
B.since
C.when
D.then
解析：
本题选C。
{02}There is only 5 minutes left．So I will select ________ questions to answer．
A.scores of
B.dozens of
C.a couple of
D.a couple
解析：从形式上看，A、B、C三项均可。从意义上看，只有五分钟的时间，不可能回答很多问题。
本题选C。