—Why not organize a school trip? — .A. Good idea.B. That’s all right.C. You’re welcome.D.

问题补充：

—Why not organize a school trip?

— .

A. Good idea.

B. That’s all right.

C. You’re welcome.

D. Never mind.

答案：

(答案→)A. Good idea.

B. That’s all right.

C. You’re welcome.

D. Never mind.

解析：why not……?等于why don’t you…?表示一种建议。四个选项中只有A项符合做它的答语，故选A。