Then I made a plaint to the manager and the problem soon．
A. was solved
B. had been solved
C. would solve
D. has been solved
网友回答
(答案→)A. was solved
B. had been solved
C. would solve
D. has been solved
解析：考查时态。And前后连接的是并列句。前后时态一致，排除D。problem和solve之间是被动关系，排除C，B选项把solve和plain之间的先后顺序颠倒，故选A.