题目内容

The new term is comingThe students are busy ________ the classroom

[  ]

A.

clean

B.

cleans

C.

to clean

D.

cleaning

答案:D
解析:

  be busy doing为固定搭配,“忙着干……”。


练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网