问题
选择题
We finally managed to make the customers _______ of the quality of the vehicle.
A．to convince
B．convincing
C．convince
D．convinced
答案
D
convince sb. of sth. 使某人确信某事，句中的customers作make的宾语，后面却宾补，而convince与the customers之间是被动关系，因此选D。