was known to them all that William had broken his promise he would give each of them a gi

问题补充：

．was known to them all that William had broken his promise he would give each of them a 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：第一个空为it作形式主语，指代后文的that从句；第二个空为同位语从句，应由that引导。.