the final examination is coming ,the students are busy---------[review] the lessons.

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thefinalexaminationiscoming,thestudentsarebusy---------[review]thelessons.thefinalexaminationiscomin

the final examination is coming ,the students are busy---------[review] the lessons.
the final examination is coming ,the students are busy---------[review] the lessons.

the final examination is coming ,the students are busy---------[review] the lessons.
reviewing

dfg

reviewing

填reviewing. be busy in doing sth 忙于做某事。其中in 可以省略。