作业帮( )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
( )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.