语法与词汇 6._____is often the case with children, Amy was better by the time the doctor arrived.
【正确答案】 D
【答案解析】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。