How many languages can you speak?
A. Many languages.
B. Pretty well.
C. 5 languages.
D. I can speak English fluently.
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May I know how old you are?
A. 20 years ago.
B. I'm 20 years old.
C. It doesn't matter.
D. When I am twenty.
某企业刚刚推出一种新产品,可选择的预测方法是()。