All mammals have hair, but not always evident.A、but it is notB、but it isC、but

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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

解析所有的哺乳动物都有毛发，但并不总是很明显。本句由but连接两个分句，第2个分句中evident的主语应该指代前面所提的毛发，而又因为hair是单数，故排除C项和D项；B项与语境不符，可排除，故答案为A项。

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