the fog we should have reached our school in time.　A. But forB. Due toC. In case of　　D.

问题补充：

the fog, we should have reached our school in time.

A. But for

B. Due to

C. In case of

D. In spite of

答案：

(答案→)A. But for

B. Due to

C. In case of

D. In spite of

解析：四个选项发表表示要不是、由于。万一和除了，根据题意UANA，要不是大雾，我们应该已经及时到校了。