| The field research will take Jone and Paul about five months; it will be a long time ____ we meet them again. |
A. after B. before C. since D. when |
科目：高中英語 來源：0103 月考題 題型：單選題
科目：高中英語 來源： 題型：
The field research will take Jone and Paul about five months; it will be a long time ____we meet them again.
A. after B before C since D when
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