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My classmate is much cleverer than I.

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在信息系统的生命周期中，经过了信息系统规划、系统分析、系统设计之后，就进入了信息系统的_______环节。

I am very familiar with his name.

He keeps looking at himself in the mirror.

____ you know, David has been well lately.

A. Which
B. As
C. What
D. When