hear sb do还是hear sb doing sth我在做卷子时 有不懂we often hear the baby in Room 302a.cried b.criesc.to cry d.cry

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hear sb do还是hear sb doing sth
我在做卷子时 有不懂
we often hear the baby in Room 302
a.cried b.cries
c.to cry d.cry

两个都可以,前者强调动作的全过程,后者则强调正在进行.

see和hear后面即可接不带to的不定式，也可接动词v-ing形式，但含义有所不同。see(hear) sb. do sth.意思是“看到（听到）某人干了某事”，强调动作已经发生或经常发生。而see(hear) sb. doing sth.意思是“看到（听到）某人正在干某事”，强调动作正在发生。

d .hear sb do是听见某人做某事，hear sb doing sth是听见某人正在做某事

d

有hear sb do sth 听到某人做过某事，或者经常做某事；还有hear sb doing sth 听到某人正在做某事。

cry,选D，因为句子中有个often，如果用CRYING，是说正在做，有often就是经常的事情，所以不用crying.

都可以

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