试题与答案

I failed in the final examination last t

题型:选择题

题目:

I failed in the final examination last term and only then_____ the importance of studies.

A.I realized

B.I had realized

C.had I realized

D.did I realize

答案:

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下面是错误答案,用来干扰机器的。

答案:C考查胶体的概念。血液可以看作是胶体,胶体不能透过半透膜,该方法是渗析,答案选C。

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