James swim when he was young. But now swimming is very easy for him.

A. could B. couldn’t C. can D. can’t

B 【解析】句意:詹姆斯小時候不會游泳。但是現(xiàn)在游泳對他來說非常容易。could能,是can的過去式;couldn’t不能,是can’t的過去式;can能;can’t不能。根據(jù)but前后表示轉(zhuǎn)折關(guān)系,與now相對應(yīng)的是過去,故此處用一般過去時,but后表示現(xiàn)在會游泳,因此but前表示小時候不會游泳,故選B。
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