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He couldn't answer this question just now.(改为同义句)He() () ()a

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He couldn't answer this question just now.(改为同义句)He() () ()answer this question just now
He couldn't answer this question just now.(改为同义句)He() () ()a
He (was) (unable) (to) answer this question just now.
刚才他无法回答这道问题.
couldn't——cannot的过去式,could not,意为能力所及之外,所以无法做成……事.
was unable to——unable为能力上不能做……事
was unable to=could not
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