【He didn't play the piano ------his sister.A.as】

问题补充：

He didn play the piano ------his sister.A.as beautiful asB.so beautiful asC.so beautifully asD.as more beautiful asAB哪错了

答案：

beautiful是形容词,beautifully是副词,可以修饰动词play,

as xx as是用在肯定句,否定是用not so xx as,所以选c