问题补充：
was known to us all that Johnson had broken his promisehe would give each of us a small 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：主要测试形式主语以及同位语从句。由题干可知关键词为：that 和promise。
【知识点分类】代词；同位语从句
