My father's bike is broken.My father is busy _ .A.to fix it up B.fixing it up C.fixing up it

问题描述:

My father's bike is broken.My father is busy _ .A.to fix it up B.fixing it up C.fixing up it

C

be busy doing sth忙于做什么
是搭配

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B

选B be busy doing, fix it up

B
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选B
be busy doing sth.的句型,所以排除A.
fix up这种可拆开的动词词组,代词一定要放在中间,所以是fix it up.