She can run ______30km an hour.

问题描述:

She can run ______30km an hour.
A.as faster as
B.so fast as
C.so faster as
D .as fast as

D as +形容词/副词的原级+as 与...一样...(肯定句中)
so/as +形容词/副词的原级+as (否定句中)