(·陕西 16) is often the case with children Amy was better by the time the doctor arrived

问题补充：

(·陕西，16) is often the case with children，Amy was better by the time the doctor arrived.

A. It

B. That

C. What

D. As

答案：

A. It

B. That

C. What

(答案→)D. As

解析：考查定语从句。此处as引导的定语从句位于主句之前，指代整个主句内容。句意：正如孩子们常有的情况一样，医生到的时候Amy就好了。