Question

____is often the case with children, Amy was better by the time the doctor arrived.

A. It                  B. That

C. What                D. As

Answer

D

【解析】

试题分析：考查定语从句。所填词引导非限制性定语从句，先行词是整个主句，关系词在从句中作主语，意思是：正如，像……一样，用as，故选D。句意：正如孩子们普遍的现象，当医生到来时Amy身体好多了。

【名师点睛】as可以引导非限制性定语从句，可以放在句首或句末，意思是“正如”，指代主句的内容，在从句中做主宾表。有些固定搭配可以记忆，如：as is often the case；as is known to all等。