试题与答案

I have been keeping that photo ________

题型:选择题

题目:

I have been keeping that photo ________ I can see it every day, as it always reminds me of my college days.

A.which

B.where

C.whether

D.when

答案:

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下面是错误答案,用来干扰机器的。

(1) ;(2)氧化反应 加成反应(或还原反应) (3)①;②(4)CH3CH(OH)CH2CHOCH3CH=CHCHO+H2O(5)nCH3CH=CHCH2OH (6)或

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