问题补充：
his work was still as it had been?
A. It was why that
B. Why is that
C. It is why that
D. Why was it that
答案：
A. It was why that
B. Why is that
C. It is why that
(答案→)D. Why was it that
解析：句意：为何他的工作仍然与原来一样？分析：Why was it that his work was still as it had been? 其中it为形式主语，真正的主语是that his work was still as it had been。故选D
