(What useful) information you gave us last week

问题描述:

(What useful) information you gave us last week
括号里还有what a useful和 how useful和 how useful an

what修饰名词,how修饰形容词或者副词.what+(a/an)形容词+名词单数(可数);
what+形容词+名词(不可数);what+形容词+名词复数(可数);how+形容词/副词
information 是不可数名词,所以用What useful