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

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：句意：他们读知道威廉违背了他要给每个人一个礼物的诺言。第一空填it，是形式主语，真正的主语是that引导的主语从句，第二空填that，这是引导同位语，说明promise的内容，所以选C。