问题
选择题
—_____ is your new teacher?
—The one standing under the tree with a dictionary in his hand. [ ]
A. Who
B. What
C. Where
D. Which
答案
答案：D
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—_____ is your new teacher?
—The one standing under the tree with a dictionary in his hand. [ ]
A. Who
B. What
C. Where
D. Which
答案：D
，则f(x)=（）。