2019年mpa考试英语真题——副词245

{01}If you often feel tired and can’t focus your attention，that is________you have to stop working too
hard and to have a rest.
A.why  
B.whether  
C.when  
D.what
解析：
本题选C。

{02}As far as I know, he is seldom, ______, late for school.
A.if so
B.if never
C.if ever
D.if any
解析：
本题选C。