smoking will certain do harm to your health.还是用certainly

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smoking will certain do harm to your health.还是用certainly
smoking will certain do harm to your health.还是用certainly

smoking will certain do harm to your health.还是用certainly
certainly

certainly, used as adv.

certain是形容词,certainly是副词。smoking will ——do harm to your health,句子中横线后面跟的是do,是个动词,因此是用certainly这个副词来修饰
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