2019年mba考试英语模拟题——连词818

{01}Find ways to praise your children often, ________ you"ll find they will open their hearts to you.
A.till  
B.or
C.and  
D.but
解析：
本题选C。

{02}He was about to jump into the river ________ his mother stopped him.
A.while  
B.when
C.as  
D.before
解析：
本题选B。

{03}Tom looked upon the test as an obstacle _____ his classmates regarded it as a challenge.
[    ]
A.while          
B.because        
C.unless            
D.if
解析：
本题选A。