高中英语习题(选择题)求解…………
Atthebeginningofclass,thenoiseofdesk()couldbeheardoutsidetheclassroom.
A.openedandclosedB.tobeopenedandclosed
C.beingopenedandclosedD.toopenandclose
请说出答案,并解释一下为什么选它,其他的为什么不能选……感谢!