题目内容
He ________ to swim when he was five.
| A．can | B．could |
| C．can be able | D．was able |
D
解析试题分析：句意: 当他五岁时就会游泳。be able to="can" 会.据when he was five主句要用一般过去时，故选D。
考点：考查情态动词。
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