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【题目】Students have rules to keep their classrooms clean.

A. canB. shouldC. needD. may

【答案】B

【解析】

句意:学生需要有保持教室清洁的规则。

A. can能,会;B. should应该;C. need需要;D. may可以。根据to keep their classrooms clean.可知这里是需要有制度。根据题意,故选B

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