I'm ______ the phone in the study.A.answer B.answers C.answering D.answered是哪个?

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I'm ______ the phone in the study.
A.answer B.answers C.answering D.answered
是哪个?

C,i'm是i am的缩写形式,am是进行时,选项A无时态,B是第三人形式,D是过去时,所以选C.

A

a

C,现在进行时 be+动词ing形式

C