Question

He speaks English well indeed, but of course not ________ as a native speaker.

A．as fluent

B．more fluent

C．so fluently

D．much fluently

Answer 1

C

not so\as ---as—“不如”；副词修饰动词。“他的英语确实很好，当然不如母语为英语的人说得流利。”所以答案为C。