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Never form the habit of smoking because it ______ human beings.
A.does harm withB.is harmful toC.is harm forD.does harmful to
B
短语辨析. be harmful to 对……有伤害的,是形容词词组结构;do harm to 造成危害。 是动词性结构。根据题意,永远不要养成吸烟的习惯,因为它对人体有害.选B.
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