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    (   ) 2.―Will you       come to my birthday party on Sunday?

          ——Sure. I'm glad I am invited.
    A.can    B.could

    C. are able to    D. be able to

    2. D be able to可用于多种时态；can只能用于一般现在时和一般过去时。

    题目来源：仁爱英语同步练习册九年级上册下册合订本 > Topic2 I'm excited about the things that will be discovered in the future.

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