—Do you know when we will carry out the plan?—Oh no. It is still discussion.A. withinB.

问题补充：

—Do you know when we will carry out the plan?

—Oh, no. It is still discussion.

A. within

B. under

C. in

D. on

答案：

A. within

(答案→)B. under

C. in

D. on

解析：B 考察介词。Under表示某事在进展中；如under discussion正在被讨论；under repair正在被修理；under construction正在被建设。