【高二语法】25.It is very difficult to tell how many years ago ___

I don't remember how many years ago ___ that people began to 英语翻译It is difficult to believe that,only eighty years ago,th To tell me one twin from the other is very difficult.同义句 ___ 造句 How many years ago It is difficult to say how many people are learning it as a This exam is very difficult. Many students are concerned ___ It is very difficult for a person to know how fast a car is 英语翻译Many parents think that it is very difficult to get thei It is very difficult to love someone . how difficult is it to save money? The new word is very difficult.Let's ___ it.A.try to read B. He found ___ very difficult to drive a car.A.him B.it is C.i