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问题: 英语非谓语动词

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
请详细解答

解答:

答案是C
首先desk与open 和 close 在逻辑上是被动关系,可以排除D;
A 中的过去分词强调状态,有动作已经发生的意义;
B 中的不定式表示动作还未发生;
C 是现在分词的被动式,动作正在发生,这样才能发出声音。