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