the advertisement has been heard ____ five times a day ,whic

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the advertisement has been heard ____ five times a day ,which makes people upset
the advertisement has been heard ____ five times a day ,which makes people upset
a.to broadcast b.to be broadcast c.broadcasting d.broadcast
为什么 a 不对

考非谓语动词
这是一个被动句,分析这种句子一定要还原来看,我们用they作为主语把句子还原成主动句,就是：
They has heard the advertisement_____ five times a day.
我们知道hear有这样三个用法：
hear sb.do sth.,hear sb.doing sth.,hear sth.done.
前面两个是主动,最后一个是被动.在这个句子中advertisement和broadcast显然是被动的,所以这里就用broadcast的过去分词形式——还是原形,不变.
所以这里就是They has heard the advertisement broadcast five times a day.
要清楚这里broadcast虽然看上去是动词原形,但是事实上它是过去分词形式,变被动的时候不用变化,所以这里选D.

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