高中英语语法知识单项选择题专练 it 的用法（word版含解析）

高中英语单项选择题分类汇总 it部分 1. In the west, people make _______ a rule to send Christmas present to their relatives and friends. A. this                                                      B. that C. it                                                         D. the following 解析：选 C。it 为形式宾语，真正的宾语是其后的不定式 to send Christmas present to their relatives and friends。 2. Everyone knows that __ is dangerous to play with fire, but __ is difficult is to prevent children from playing with fire. A. it; it B. what; what C. it; what D. what; it 分析：很容易误选A，认为两个空均考查形式主语。 答案是C，第一个空填形式主语it，真正的主语是其后的不定式to play with fire。第二个空填what，what is difficult是主语从句，注意what is difficult后面的谓语动词is。请做以下类似的试题（答案均是C）： （1）I know __ is important to know my own limitation, but __ is difficult is to help others to know their own limitations. A. it; it B. what; what C. it; what D. what; it (2)Yes, __ is difficult to find a job nowadays, but __ is more difficult is to try to find such a job with a hig