题目内容
【题目】 Our classmates _________ pollute the air.
A. promises to B. promise to not C. promise not to D. promise to
【答案】C
【解析】略
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题目内容
【题目】 Our classmates _________ pollute the air.
A. promises to B. promise to not C. promise not to D. promise to
【答案】C
【解析】略