Look!Here comes a ___ train.It runs so___. A.fast;fastly B.fastly;fast C.fast;fast D.fast;faster

问题描述:

Look!Here comes a ___ train.It runs so___. A.fast;fastly B.fastly;fast C.fast;fast D.fast;faster

C
train是名词,前面修饰词用形容词,作定语;后一格run是动词,修饰动词用副词要用副词形式
fast 形容词和副词同形,所以两个格都是fast