He was able to solve the mystery. He ______. a．could if he w

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He was able to solve the mystery. He ______. a．could if he wanted to b．could but he didn't want to
He was able to solve the mystery. He ______.
a．could if he wanted to
b．could but he didn't want to
c．succeeded in solving it
d． didn't succeed in solving it
这个题为什么不选A,我感觉A也对?
He was able to只能说明他有能力去解决，选c不是说他已经成功解决了吗？有能力做但并不一定去做啊

选c
be able to表能力且一定成功,故选c
再问： be able to不是只表有能力吗？有能力但不一定去做啊,为什么表一定成功？
再答： be able to和can都表能力但be able to表示能成功can则不一定，这是区分

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