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Jack _______ swim when he was five years old.
A.canB.could C.mayD.must
B
词义辨析。Can,could能,会;may可以;must必须。句意:杰克5岁时会游泳。排除C,D;根据when he was five years old,可知要用一般过去时,所以选B ,could,表过去能够。
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