2019年mpa考试英语真题——介词和介词短语139

{1Why are you here playing games ________ you should be in class studying?
A.when
B.till
C.so that
D.unless
解析：
本题选A。
{02}Seeing the car speeding up, he warned us to ________．
A.look up
B.look in
C.look by
D.look out
解析：
本题选D。