2019年mpa考试英语真题——介词和介词短语430

{01}The newly learnt words will soon be forgotten ________ frequently used in everyday communication．
A.if they are
B.unless they are
C.when they are
D.till they are
解析：
本题选B。
{02}No one can attain great achievements ________ he concentrates on what he is doing, even though a talent．
A.because
B.while
C.unless
D.if
解析：
本题选C。