问题补充：
I talked for a long time, and in the end I make her believe me.
A. should
B. can
C. was able to
D. must
答案：
A. should
B. can
(答案→)C. was able to
D. must
解析：考查情态动词：A. should应该B. can能C. was able to能D. must必须，句意：我谈论很长时间，最后我终于能够让她相信我了。B和C都可以表示“能够”，但是can表示“有能力，但不一定做到”，be able to表示“有能力而且做到了”相当于manage to do/succeed in doing.选C。
