life in the twenty-first century is much easier than it used to be.中的it used to be 是做什么成分不太懂这些东西

(In my opinion,life in the twenty-first century is much easier than it used to Life in the twenty-one century will be very different as life today.亲爱的老师,正确答案是：Life in the twenty-one century will be very different from life today.如果我使用as 做连接life today 以 life in twenty years为题70字的作文 Mike is now f-----the biggest problem in his life. （ ）Beijing hosted _____ Olympic Games in 2008.A.twenty-nineB.the twenty-nineC.twenty-ninthD.the twenty-ninth life in the twenty-first century is much easier than ________.life is much easier than (it) was in the 20 centry求两个句子具体分析和对比life in the twenty-first century is much easier than it used to be life in the future Life in the most life in the life in the 7.Shirley used to live in the countryside.She ___________ there for twenty years,but nowshe is used to the city life.(live)说明为什么 life in the twenty-first century is much easier than ________.life is much easier than (it) was in the 20 centry 求两个句子具体分析和对比 life in the twenty-first century is much easier than it used to be.中的it used to be 是做什么成分不太懂这些东西 In my opinion, life in the twenty-first century is much easier than what itIn my opinion, life in the twenty-first century is much easier than_____.A. that used to be; B. what it is used to; C. what it was used to; D. what it used to be;选D, We will travel to the moon in twenty years划线部分提问in twenty years --------------- 1.There is ____“f”in the word “life”.A.a B.an C.the D./ over the past twenty years 还是in the past twenty years We live in ( ) A the twenty--first centry B the century twenty-one C century twenty -oneD the century twenty-first