They didn’t accept my invitation at first, but I_____persuade them at last.

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问题 They didn’t accept my invitation at first, but I_____persuade them at last.

选项 A、could
B、was able to
C、might
D、can

答案B

解析 考查情态动词。could是can的过去式,比can委婉,表示能够,但做了不一定成功;might表示可能;be able to表示通过努力做成功了某事。由persuade them at last可知选B。
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