2019年mpacc考试英语真题——连词695

{01}— How long do you think it is _______ he took up the job?
— Half a year at least.
[      ]
A.when      
B.before      
C.that      
D.since
解析：
本题选D。

{02}Experts are trying to work out a plan to deal with the problems caused by global warming________
it is too late.
[      ]
A.when  
B.if  
C.before  
D.until
解析：
本题选C。