问题补充：
-- Are you going to participate in the speech contest?
-- How wonderful an opportunity!
A. No problem!
BWhy bother?
C. Why not?
D. Thats for sure.
答案：
A. No problem!
B. Why bother?
C. Why not?
(答案→)D. Thats for sure.
解析：考查情景交际。根据后面 “How wonderful an opportunity!”提示，答案为D. “确信无疑。”
