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

问题补充：

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

A. It; that

B. What; that

C. As; which

D. It; which

答案：

(答案→)A. It; that

B. What; that

C. As; which

D. It; which

解析：本题中的第一空使用it作为形式主语，真正的主语是后面that引导的主语从句。在英语中能够作为形式主语或者形式宾语的只有it。第二空考察的是同位语从句，使用that引导的同位语从句解释名词promise的内容，that在句中不充当任何成分，只起引导和连接作用。句义：众所周知，Tom违背了他给我们每个人一个礼物的诺言。故A正确。