is often the case he succeeded in this examination again.A. WhatB. SoC. WhichD. As

问题补充：

is often the case,he succeeded in this examination again.

A. What

B. So

C. Which

D. As

答案：

A. What

B. So

C. Which

(答案→)D. As

解析：考查连词。as引导非限制性定语从句，可以放在句首。