—Could we go and visit the Summer Palace?—Yes .This should be on our list of things to do

问题补充：

—Could we go and visit the Summer Palace?

—Yes，.This should be on our list of things to do in Beijing.

A. a pleasure

B. it depends

C. don mention it

D. by all means

答案：

A. a pleasure

B. it depends

C. don mention it

(答案→)D. by all means

解析：考查交际用语。by all means在句中意为”当然可以”。——我们可以去参观颐和园吗？——好的，当然可以，这应当是我们在北京要做的事情之一。