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：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。