(   ) 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 ...可用于多種時(shí)態(tài)；can只能用于一般現(xiàn)在時(shí)和一般過去時(shí)。

題目來源：仁愛英語(yǔ)同步練習(xí)冊(cè)九年級(jí)上冊(cè)仁愛版 > Topic2 I'm excited about the things that will be discovered in the future.

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