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