问题
选择题
______ 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
答案：D
从句置于句首只有引导词as 可以。as引导的为限制性定语从句，as在句中作主语，指代后面的整个句子。句意：就像孩子们常有的情况一样，等大夫到了艾米的情况就好多了。
【考点定位】考查定语从句