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

B


解析:

before意為“在……之前”。根據(jù)所提供的情景The field research will take Joan and Paul about five months可判斷出表示“要很長時間我們才能再見面”。after意為“在……之后”。since引導(dǎo)時間狀語從句意為“自從”，表示動作從過去的某個時候開始一直延續(xù)到現(xiàn)在，常與現(xiàn)在完成時連用。when意為“當(dāng)……的時候”。

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