. is good for you going to bed early and getting up early.A. It B. As C. This D. That

问题补充：

. is good for you going to bed early and getting up early.

A. It

B. As

C. This

D. That

答案：

(答案→)A. It

B. As

C. This

D. That

解析：It 为形式主语，真正主语为going to bed early and getting up early。句意：早睡早起对你有好处。