问题
选择题
What would you like? [ ]
A. I'd like some beef.
B. Let me try.
C. Help yourself.
答案
答案：A
搜题请搜索小程序“爱下问搜题”
What would you like? [ ]
A. I'd like some beef.
B. Let me try.
C. Help yourself.
答案：A
发生机制是（）。