---Do you have any idea what the students of Grade Three do in your school?---They spend more time working on their lessons than they ________．A.do taking exerciseB.take exerciseC.taking exerciseD.have taken exercise
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A解析本题要弄清被比的对象。为了避免重复，用do代替spend。花时间做某事的句型是：spend+time+doing something。