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英语 根据提示 填空1 She is very now .She can _h_____ have time to ta

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英语 根据提示 填空
1 She is very now .She can _h_____ have time to talk with you .
2 He ________ (must try ) to eat less chocolate .
3 How often _____ Jack ______ (surf ) the internet
1 hardly
2 must try
3 does ,surf
再问: 第2个 must后面不用加s吗?
再答: must是情态动词,不受人称和数的影响(即不变,另外,它后面的动词必须用原形)