问题
In my opinion, life in the twenty-first century is much easier than _____. [ ]
A: that used to be
B: it is used to
C: it was used to
D: it used to be
B: it is used to
C: it was used to
D: it used to be
正确答案是：
同类题型
I have finished my homework.—___________.Let’s go to play tennis.
He moved to Beijing in 1990 and________there fromthen on.[ ]
_____merely on what the average is , and you’ll remain average
I don’t doubt ________ the plan will be well-conceived.
_and short of breath, Andy and Ruby were the firstto reach the top of Mount Tai