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--- Let’s go to play football, shall we?
--- Sorry, I can’t. I must go over the points the teacher explained ______ I forget them.
A.afterB.whenC.beforeD.since
C
连词辨析。A.在……之后;B. 当……时    C. 在……之前D. 自从……以来。句意:让我们去踢足球,好吗?——抱歉,我不能。我必须在我忘记他们之前复习老师解释过的要点。故选C。
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