They didn′ t accept my invitation at first, but I____________ persuade them at last.

2023-08-07

A.could
B.was able to
C.might
D.can


参考答案:B

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。