2019年mpacc考试英语真题——连词685

{01}________ you have the drug habit, you"ll find it hard to get rid of.
[      ]
A.Unless  
B.Once  
C.Though  
D.Before
解析：
本题选B。

{02}—The plane is due to take off at 7:50 from the airport.
—________ we fail to arrive there in time?
—Try to take another flight then.
A.What if  
B.As if
C.Even if  
D.Only if
解析：
本题选A。