题目

单项填空It’s our duty to_______ people_______too many trees.A.stop; cutting down                  B.prevent;to cut downC.keep;cutting down                   D.make;cut down 答案：A  stop/prevent/keep sb. from doing sth.都表示“阻止某人做某事”,在主动语态中stop...from...和prevent...from...中的介词from可以省略，但keep...from...中的from不能省略。

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