was known to us all that Johnson had broken his promise he would give each of us a small

问题补充：

was known to us all that Johnson had broken his promise he would give each of us a small gift.

A. As；which

B. What；that

C. It；that

D. It；which

答案：

A. As；which

B. What；that

(答案→)C. It；that

D. It；which

解析：第一空it作形式主语，真正的主语是that Johnson...；第二空that引导的是同位语从句，用以解释promise的内容。