—Mom,whencanIgoouttoplayfootball?—Finishyourhomeworkfir...

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—Mom, when can I go out to play football?

—Finish your homework first, or I ________let you go out.

A. don't B. didn't C. won't D. haven't

解析考查动词的时态。根据题意“妈妈，我什么时候可以出去踢足球？”“首先完成作业，否则，我不会让你出去的”可知，本句用一般将来时，故用won't。