was often the case, Miss Wang was the first to arrive at the school in the morning .
A. Which
B. What
C. As
D. It
网友回答
A. Which
B. What
(答案→)C. As
D. It
解析：考查非限制性定语从句：句意：情况经常是这样，王老师是早上第一个到学校的。这里用as引导非限制性定语从句，指代后面的句子，which也可以引导非限制性定语从句，但是which不能放在句首，选C。