The student are busy___their lessons these days.(review)

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Thestudentarebusy___theirlessonsthesedays.(review)Thestudentarebusy___theirlessonsthesedays.(review)

The student are busy___their lessons these days.(review)
The student are busy___their lessons these days.(review)

The student are busy___their lessons these days.(review)
reviewing be busy doing sth 忙于做某是

for

reviewing
be busy doing sth.是固定用法

reviewing