The field research will take Joan and Paul about five months; it will be a long time _____

The field research will take Joan and Paul about five months; it will be a long time _______ we meet them again.

A.after    B.before    C.since     D.when

答案

B


解析:

该空表示在我们再见面之前要过很长时间,因此应填before引导时间状语从句。

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