What's happening?He ______ (keep laughing) all the time.用括号内词组的适当形式填空

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What's happening?He ______ (keep laughing) all the time.用括号内词组的适当形式填空
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What's happening?He ______ (keep laughing) all the time.用括号内词组的适当形式填空
What's happening?He ______ (keep laughing) all the time.
用括号内词组的适当形式填空

What's happening?He ______ (keep laughing) all the time.用括号内词组的适当形式填空
keeps laughing用第三人称单数
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has kept laughing

is keeping
发生什么了?他一直在笑。

has been keeping laughing
is keeping laughing
都可以

has kept laughing 因为是all the time,所以是从过去某个时候开始发生一直延续到现在,并有可能延续下去,所以用现在完成进行时

can't
can't keep ding sth禁不住做某事

keeps
用了keeps,就不必把keep写成现在进行时。

keeps laughing