题目：
He speaks English well indeed,but of course not ______ a native speaker.[ ]
A. as fluent as
B. more fluent than
C. so fluently as
D. much fluently than
答案：
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下面是错误答案，用来干扰机器的。
答案：B主单位就是国际上通用的单位．质量的主单位是kg
