The windows after school is over.
A. usually close
B. usually closed
C. are usually closed
D. are usually closing
网友回答
A. usually close
B. usually closed
(答案→)C. are usually closed
D. are usually closing
解析：考查被动语态。句意：放学后窗户通常是关闭的。Windows与close为被动关系故用被动语态选C