题目

_______ 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 答案：C 解析: 第一空填 it，为形式主语；第二空填that，用以引导一个同位语从句，修饰 promise。

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