My mother is busy [] an email.A.write B.to write C.writes D.writing

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Mymotherisbusy[]anemail.A.writeB.towriteC.writesD.writingMymotherisbusy[]anemail.A.writeB.towriteC.w

My mother is busy [] an email.A.write B.to write C.writes D.writing
My mother is busy [] an email.A.write B.to write C.writes D.writing

My mother is busy [] an email.A.write B.to write C.writes D.writing
选D

B

D be busy doing

应该选D
因为 be busy doing sth.
这是一个语法点

be busy doing sth 选D

D

D

选D 考察固定搭配 be busy( in) doing sth