583.At the beginning of class,the noise of desks ______ could be heard outside the classroom.
A.opened and closed
B.to be opened and closed
C.being opened and closed
D.to open and close
584.“Things ______ never come again!”I couldn't help talking to myself.
A.lost
B.losing
C.to lose
D.have lost
583.答案是C;由句意可知课桌应该被开关,此处desks being opened and closed为动名词的复合结构作介词of的宾语。
584.答案是A;lost为过去分词转化来的形容词,作things的定语,相当于定语从句that are lost。
