--- 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．a(chǎn)fterB．whenC．beforeD．since
C
連詞辨析。A.在……之后；B. 當……時    C. 在……之前D. 自從……以來。句意：讓我們?nèi)ヌ咦闱�，好嗎？——抱歉，我不能。我必須在我忘記他們之前復習老師解釋過的要點。故選C。
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