he 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

B。


解析:

該空表示在我們?cè)僖?jiàn)面之前要過(guò)很長(zhǎng)時(shí)間，因此應(yīng)填before引導(dǎo)時(shí)間狀語(yǔ)從句。

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