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.