John is good Maths. He can Maths exercises quickly. ( )A.at; doB.in; doC.for; doesD.at; does

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【题目】John is good _____ Maths. He can _____ Maths exercises quickly. ( )

A.at; doB.in; doC.for; doesD.at; does

【答案】A

【解析】

句意为约翰擅长数学，他能很快地做数学练习，be good at意为擅长做某事，情态动词can（能够）后接动词原形do，BCD均不符合题意，故选A。