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

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(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。