问题
选择题
They used to make ________ to meet and have a party at the end of a month.
A．a rule
B．it a rule
C．it rule
D．them a rule
答案
答案：B
考查代词。本题考查it作形式主语，真正的主语为不定式to meet and have a party at the end of a month，rule为可数名词，故选B。