—How do you like his plan?—It may be so in _ theory but how will it work in practice?A.

问题补充：

—How do you like his plan?

—It may be so in _ theory, but how will it work in practice?

A. the; the

B. /; /

C. the; /

D. /; the

答案：

A. the; the

(答案→)B. /; /

C. the; /

D. /; the

解析：句意:——你觉得他的计划怎么样?——可能在这个理论是这样,但在实践中它会起作用吗？

in the theory 在理论上；in practice 在实践中。故选B。