动词的语态.

题目

动词的语态.
1.More free time should____ for students
A.offer B.is offered C.be offered D.be offering
2.The government announced that schools___ for three days the next week
A.will be closed B.have been closed
C.would be closed D.would close
3.The window is terribly dirty.I know.it____for weeks
A.hasn't cleaned B.didn't cleaned C.wasn't cleaned D.hasn't been cleaned

答案

C 时间是被提供给学生们,所以用被动
A 因为是下一个星期,所以用一般将来时
D 窗户是被清理,所以用被动,并且是说在过去的几个星期内都没有被清理,所以要用完成时,表示在过去几个星期内,窗户一直没有被清理