( )The students are busy ___over their lessons.Agoing Bwith Cto go Dwith going

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()Thestudentsarebusy___overtheirlessons.AgoingBwithCtogoDwithgoing()Thestudentsarebusy___overtheirle

( )The students are busy ___over their lessons.Agoing Bwith Cto go Dwith going
( )The students are busy ___over their lessons.Agoing Bwith Cto go Dwith going

( )The students are busy ___over their lessons.Agoing Bwith Cto go Dwith going
be busy doing sth.