1.B 根据句意,空处应该是否定意思,而 ACD选项都是肯定意思,所以B.
2.C 因为since+时间点或过去时态的句子时,翻译为自什么时间以来,与现在有关,与现在完成时连用,所以C.
3.A.此句意思是 一些生物为了适应环境,能改变自身特征.环境应该用it 代替.
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