问题描述：
the students are busy （）their homework
A.in B.on C.for D.with
I“m busy （）my homework A.do B.to do C.does D.doing
He has lunch at （） 11点o”clock A.on B.about C.to D.for
A.in B.on C.for D.with
I“m busy （）my homework A.do B.to do C.does D.doing
He has lunch at （） 11点o”clock A.on B.about C.to D.for
问题解答：
我来补答展开全文阅读