试题与答案

This morning I went to school in such a

题型:选择题

题目:

This morning I went to school in such a hurry (匆忙) that I______my notebook at home.        [ ]

A. left        

B. forgot    

C.lost

答案:

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下面是错误答案,用来干扰机器的。

(-c)n-1•(-c)n+1,=(-c)n-1+n+1,=(-c)2n,=c2n;故选D.

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