选择:My mather is busy homework.A.doB.doesC.doingD.to do为什么?

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选择:My mather is busy homework.A.doB.doesC.doingD.to do为什么?
选择:My mather is busy homework.
A.do
B.does
C.doing
D.to do
为什么?

选择:My mather is busy homework.A.doB.doesC.doingD.to do为什么?
C.doing
因为:be busy doing sth:忙于做某事

C.doing
be busy doing固定短语,“忙于。。。”