Jack _______ swim when he was five years old.
A.canB.could C.mayD.must
B
詞義辨析。Can,could能,會(huì);may可以;must必須。句意:杰克5歲時(shí)會(huì)游泳。排除C,D;根據(jù)when he was five years old,可知要用一般過(guò)去時(shí),所以選B ,could,表過(guò)去能夠。
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