2019年mpacc考试英语真题——连词626

{01}It will be five years ____ we meet again.

A.since

B.after

C.before

D.when

解析：选C。该题意为“要过五年我们才能再见面”。如果选A, since 从句中常用动词的过去式,这是个终止动词表延续的句型。本句句型是“ It will be +时间段+before”从句。意为“要过多久才….”。
本题选C。

{02}A man does not know the difficulty of anything_________ he does it personally.

A.although

B.if

C.because

D.unless

解析：连词unless本身具有否定意义：i￡．．not，引导的是否定的条件句，这种否定的条件句从反面来强调的语气，一些语法学家称它为“反面的惟一条件句”，如： One cannot master a foreign language well unless he studies it hard．
本题选D。