2019年mba考试英语模拟题——连词587

{01}___________ they lack official support, they continue their struggle.  
A.Until            
B.If            
C.Though        
D.Before
解析：
本题选C。

{02}He made a mistake, but he corrected the situation_________ it got worse .
[      ]
A.before
B.after
C.until
D.once
解析：
本题选A。

03}____ you promise to buy her a gift, you can"t break it in any case.
A.Once        
B.Until      
C.For      
D.That
解析：
本题选A。