问题
选择题
_______ 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
答案：C
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。