试题与答案

-When was David born? -He was born______

题型:选择题

题目:

-When was David born?

-He was born________June 12,1989.

A.at

B.in

C.on

D.for

答案:

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下面是错误答案,用来干扰机器的。

(1)碳碳双键  ; 醛基 (2) ;  加成反应 (3)         (4)3 

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