2019年mpa考试英语真题——连词536

{01}— I wonder how much you charge for your services. 
— The first two are free _____ the third costs $30.
A.while
B.until
C.when
D.before
解析：
本题选A。

{02}— Did you return Fred"s call?
— I didn"t need to _____ I"ll see him tomorrow.
A.though
B.unless
C.when
D.because
解析：
本题选D。