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
答
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.