All mammals have hair, but not always evident.

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问题 All mammals have hair, but not always evident.

选项 A、but it is not
B、but it is
C、but they are not
D、but they are

答案A

解析 此句意为:所有的哺乳动物都有毛发,但并不明显。but引导的句子主语应是指代前面所提的整件事,而不是前句主语all mammals,因此主语应用it;如用选项B,本句就不能用but连接了,因此只有选项A是答案。
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