2019年mba考试英语模拟题——连词842

{01}There are many factors contributing to the explosion of being too fat in the United States and the world,
______ the fundamental changes in the composition of their diet are first among them. 
A.so
B.for
C.but
D.however
解析：
本题选C。

{02}Mary was on the point of leaving the room ___________the telephone rang.
A.when        
B.while      
C.as        
D.but
解析：
本题选A。