Why didn’t you tell me the truth that day?- I but you for Beijing.A. would have;

问题补充：

--- Why didn’t you tell me the truth that day?

--- I , but you for Beijing.

A. would have; left

B. would; had been away

C. would have; had left

D. had; were away

答案：

A. would have; left

(答案→)B. would; had been away

C. would have; had left

D. had; were away

解析：考查虚拟语气，根据didn you tell me可知，这是对过去的虚拟，答句中前半句是虚拟，but后面是事实，句意为，我本来要告诉你的，但是你离开去北京了。