问题
选择题
| If I _____ you, I would wear a red skirt at the party. |
A. was B. am C. were D. will be |
答案
答案：C
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| If I _____ you, I would wear a red skirt at the party. |
A. was B. am C. were D. will be |
答案：C
的单调区间、极值和曲线y=f(x)的凹凸区间．