―If the traffic hadn’t been so heavy I could have been back by 6 o’clock. ―What a pity!

问题补充：

―If the traffic hadn’t been so heavy, I could have been back by 6 o’clock.

―What a pity! Tina here to see you.

A. is

B. was

C. would be

D. has been

答案：

A. is

(答案→)B. was

C. would be

D. has been

解析：由句意知，Tina现在已走，刚才在这里等你，因此用一般过去时。