( )The students are busy ___over their lessons.Agoing Bwith Cto go Dwith going
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![( )The students are busy ___over their lessons.Agoing Bwith Cto go Dwith going](/uploads/image/z/9180881-17-1.jpg?t=%28+%29The+students+are+busy+___over+their+lessons.Agoing+Bwith+Cto+go+Dwith+going)
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( )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.