Mr. Li asks the students _______ in the river, because it’s too dangerous.

  A. swim                    B. to swim                    C. not to swim                     D. to not swim


C   ask sb. to do sth. “要求某人做某事”；ask sb. not to do sth. “要求某人不要做某   

事。”由句意“李老師要求學(xué)生們不要到河里游泳，因為太危險了”知C項符合

題意。


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