问题补充:
It five years since he Beijing.
A. was, left
B. has been, has left
C. is, left
D. is going to be, has left
答案:
A. was, left
B. has been, has left
(答案→)C. is, left
D. is going to be, has left
解析:句意:自从他离开北京已经有五年了。分析:这是一个固定的句型:It is +时间+since+从句(从句用一般过去时)。故选C