--- 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.after | B.when | C.before | D.since |
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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.after | B.when | C.before | D.since |