2019年mpa考试英语真题——副词390

01}Don"t answer me with a simple "yes" or "no". Explain ______ possible.
A.whoever    
B.whenever      
C.however      
D.whatever
解析：
本题选B。

{02}_____ some mammals came to live in the sea is not known.    
A.Which
B.Since
C.Although
D.How
解析：
本题选D。