Ifound________difficulttounderstandm

单选题 I found________difficult to understand mat old lady．A.itB.thisC.thatD.very

A解析分析：it在这里用作形式宾语，宾语是动词不定式to understand that old lady，动词find带有宾语加宾语补语结构时，如果宾语是动词不定式，要用it作形式宾语，把宾语动词不定式放到后面去。本句可以改为it作形式主语的句子：I found that it was difficult to understand that old woman．(延伸)注意下列句中it的用法1)I have bought a car．It is very nice．(it指上文提到的同一物，这里指的是the car)2)—Who is knocking at the door？—It's me．(it指上文敲门的人，这种用法中it可以指“人”)3)It is raining now，but it'll be fine soon．(it指天气the weather)4) What time is it now？It's eight o'clock．(it指时间)5)It isn't far from here to the hospital．(it指距离)6)It's important to fight pollution．(动词不定式作主语时，常用it作形式主语，放在句首)

我学会了