—Jim,comeout.Let’sgotoplayfootball.—Sorry.I’m

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问题详情:

—Jim,comeout.Let’sgotoplayfootball.—Sorry.I’m

—Jim, come out. Let’s go to play football. —Sorry. I’m _______ a math problem.

 A. working out   B. working on   C. working for    D. working at

【回答】

B

知识点:动词和动词短语

题型:选择题

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