The important news was heard ____ twice on the radio.A. to broadcast B. broadcast C. broadcasting D.having broadcasted解释一下

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The important news was heard ____ twice on the radio.A. to broadcast B. broadcast C. broadcasting D.having broadcasted解释一下

The important news was heard ____ twice on the radio.A. to broadcast B. broadcast C. broadcasting D.having broadcasted解释一下
The important news was heard ____ twice on the radio.
A. to broadcast B. broadcast C. broadcasting D.having broadcasted
解释一下

The important news was heard ____ twice on the radio.A. to broadcast B. broadcast C. broadcasting D.having broadcasted解释一下
B.broadcast
broadcast 这个动词,过去式和过去分词加不加-ed 都可以.
选 B 是取其过去分词的形式,被动语态表达 “...在收音机中【被播放】了两次”

A 就像是sb was said to do sth

D was heard having broadcasted 已经被播放两次

A hear是感官动词,一般都跟do sth.(省略的to不定式)/doing sth. 只有在被动语态中,还原to,例句:我和朋友散步被看到。I was seen to walk with my friend.

A。意味“那条重要的新闻听说将要在录音机里播两次。to do表示将要发生的动作