was often the case Miss Wang was the first to arrive at the school in the morning .A. Whi

问题补充：

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

答案：

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。