纠结,Something must be done to ( ) young people ( ) smoke.A.st

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纠结,
Something must be done to ( ) young people ( ) smoke.
A.stop,from B.make,not to C.keep,from D.encourage,not to
A.C貌似都跟doing,而且貌似必须有,不能省略doing,直接加n..
B 又不能加to .D不能加not,没这个词组.鼓励...说不通的.
纠结.....说下理由...谢.

D.encourage sb to do sth 也是固定短语,鼓励某人做某事的意思.句意：必须做点什么事来鼓励青少年不要吸烟.只有这个结构是对的,其他三项你解释的很好,都不对.

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