Question

-He is not a friend of yours,is he?-_____,I have never seen him before.

-He is not a friend of yours,is he?-_____,I have never seen him before.
A、No,he isn't B、No,he is C、Yes,he is D、yes,he isn't
答案选A，我想问问这是为什么，我需要详细解答。

Answer 1

首先根据后面的回答I have never seen him before说明他确实不是他的一个朋友，所以确定应该是no，这儿也叫做假戏真做，其次反问句为is he？所以回答应该和其相反所以应该是he isn't ，这类题都有这个规律，也可以这样理解：He is not a friend of yours，is he？可以理解为 He is not a friend of yours，is he not a friend of yours？也就是问他不是你的一个朋友，他是吗？根据后面的回答确定不是应该为no，他不是（he isn't），这类题就是这个规律，除了反问词为几个特殊的疑问词，这一点随便这个语法书上面都会有介绍，希望对你有用！

Answer 2

B和D排除，它们在语法上就错误了。

我们要回答的其实是is he?根据后文,I have never seen him before，我们要给出的是否定的回答，所以选A