题目:
26. When I asked her what she did yesterday , she pretended ___about it .
A.not to hear
B.not having heard
C.to not have heard
D.not to have heard
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:哺乳动物的主要特征:体表被毛、胎生、哺乳,体温恒定。