问题
选择题
Can you tell _______ ? [ ]
A. when did it happen
B. when was it happened
C. when it happened
D. when it was happened
答案
答案：C
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Can you tell _______ ? [ ]
A. when did it happen
B. when was it happened
C. when it happened
D. when it was happened
答案：C
，则f（2）+f（-2）的值为（）。