【急!初三英语用所给词的适当形式填空】Birds are hardly heard____(sing) at night.Birds are hardly heard______(sing) at night.如果可以解释一下就更好了,

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【急!初三英语用所给词的适当形式填空】Birds are hardly heard____(sing) at night.Birds are hardly heard______(sing) at night.如果可以解释一下就更好了,
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【急!初三英语用所给词的适当形式填空】Birds are hardly heard____(sing) at night.Birds are hardly heard______(sing) at night.如果可以解释一下就更好了,
【急!初三英语用所给词的适当形式填空】Birds are hardly heard____(sing) at night.
Birds are hardly heard______(sing) at night.如果可以解释一下就更好了,

【急!初三英语用所给词的适当形式填空】Birds are hardly heard____(sing) at night.Birds are hardly heard______(sing) at night.如果可以解释一下就更好了,
to sing.
be heard to do sth.和be heard singing 两种形式都有,但前者强调的是这件事还没做,后者是被听到正在做某事,由此题意,应该填不定式.