2019年mpacc考试英语真题——连词701

{01}— Mum, I want to play computer games now.
— Sorry, you can"t________you have finished your homework.
A.when    
B.if  
C.after  
D.until
解析：
本题选D。

{02}In time of serious accidents, we know some basic things about first aid,        we can save lives.   
A.whether      
B.until    
C.if          
D.unless
解析：
本题选C。