Can you tell me how to improve my English?- Do more speaking I think you will be

问题补充：

--- Can you tell me how to improve my English?

--- Do more speaking, I think , you will be good at spoken English.

A. or

B. for

C. and

D. until

答案：

A. or

B. for

(答案→)C. and

D. until

解析：这是祈使句+ and+将来时的句子，相当于if+从句，主句的结构。句意:--你能告诉我如何提高我的英语吗？--我认为多说，你将会擅长说口头英语的。