问题补充：
--- English is widely spoken in the world, isn’t it?
---Yes. It’s spokenabout 400 million people as the first language.
A. for
B. as
C. with
D. by
答案：
A. for
B. as
C. with
(答案→)D. by
解析：A. for对于 B. as作为 C. with用 D. by被；句意：英语被世界广泛应用，不是吗？是的，它被4亿人作为第一语言使用。题中英语被说，用被动语态，用by 来引出动作的执行者，故选D
