Don't wait for people to be friendly,show them ___a friendly person you are.A.what B.how C.whenDon't wait for people to be friendly,show them ___a friendly person you are.A.what B.how C.when它答案是选A,但我不知道为什么要选A,请说说原因.还有,有些网友说从：1、what a friendly person you are.2、how friendly you are.这两句话可以知道选什么,但又有人说第二句应是 how friendly a person you are.到底how friendly you are.和 how friendly a person you are.哪句才是正确的,

答案选A是正确的. 因为:

what 修饰名词. how 修饰形容词.

what a/an+形容词+名词+主语+谓动!

=how+形容词+a/an+名词+主语+谓动!

=how+形容词+主语+谓动!

因此, what a friendly person you are.
how friendly a person you are.
how friendly you are 都是正确的.

how friendly you are和 how friendly a person you are其实都是对的
上面的问题是感叹句,感叹句分两种形式：
What+名词或how+形容词
上面a friendly person 是名词词组,故选A
而how friendly you are还原后为：
You are friendly
how friendly a person you are中aperson和you是同位语