． 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
网友回答
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。.