They didn′ t accept my invitation at fir

练习题库2022-08-02 23

问题 They didn′ t accept my invitation at first, but I____________ persuade them at last.A.couldB.was able toC.mightD.can

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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