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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