非谓语动词 At the beginning of the class,the noise of非谓语动词At the beginning of the class,the noise of desks ___could be heard outside the classroom.being opened and closed我选的是 opened and closed为什么时态是进行时呢?题

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非谓语动词 At the beginning of the class,the noise of非谓语动词At the beginning of the class,the noise of desks ___could be heard outside the classroom.being opened and closed我选的是 opened and closed为什么时态是进行时呢?题
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非谓语动词 At the beginning of the class,the noise of非谓语动词At the beginning of the class,the noise of desks ___could be heard outside the classroom.being opened and closed我选的是 opened and closed为什么时态是进行时呢?题
非谓语动词 At the beginning of the class,the noise of
非谓语动词
At the beginning of the class,the noise of desks ___could be heard outside the classroom.
being opened and closed
我选的是 opened and closed
为什么时态是进行时呢?题中貌似没有明确的时间标志呀.

非谓语动词 At the beginning of the class,the noise of非谓语动词At the beginning of the class,the noise of desks ___could be heard outside the classroom.being opened and closed我选的是 opened and closed为什么时态是进行时呢?题
这是老教材课文the last lesson中的句子.主语是the noise 后有个介词of, 而介词后要接动名词,所以它后面应该出现doing的形式.而desks是被开和关的.所以用了动名词的被动式,即:being done.
所以说答案就成了being opened and closed.
还有,句子中的desks是做后面这个动名词的逻辑主语的.其他如:
Do you mind smoking here?没说是谁吸烟
Do you mind my smoking here?句子是说我吸烟,表示了动名词的执行者或承受者,也就是动名词的逻辑主语.
附:这不是时态,是非谓语动词的形式.

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