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

       —Sure. I'm glad I was 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仁爱版 > Topic2 I'm excited about the things that will be discovered in the future.

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