单选题
1.Since he left the university,he _______ in an accounting company.
A.has been working
B.had worked
C.had been working
D.was working
正确答案:A
答案解析:本题考查时态。Since引导的从句使用了一般过去时态,表明主句动作从过去开始一直持续到说话时间,因此用现在完成进行时态。