单选题 It was known to us all that Johnson had broken his promise ______ he would give each of us a small gift.
【正确答案】 C
【答案解析】[解析] 分析句子结构可知，本句为同位语从句，空格处的前后均为完整的句子，所以此处要用that来引导。he would give each of us a small gift是promise(承诺)的具体内容，that在句中不担当句子成分。故选C。