问题补充:
—Mike invited us to take part in the party this Sunday.
—Is tomorrow his birthday?
A. Why not?
B. That’s all right.
C. What for?
D. What a good idea!
答案:
A. Why not?
B. That’s all right.
(答案→)C. What for?
D. What a good idea!
解析:根据Is tomorrow his birthday?可知,对方应该是很惊讶,不知为什么会邀请我们去参加晚会,故应该用what for。所以本题选C。