问题
Scientists are working hard to make _______ possible for people to live on Mars in the future.
A:it
B:that
C:this
D:one
B:that
C:this
D:one
正确答案是：
同类题型
No decision _________ about that matter yet. We are still considering it.
Sometimes an ad can lead you to buy something you don’t need at all. “Sometimes”means______. [ ]
There’s only ten minutes to go. We can’t wait any more—- ______, we should start at once.
Listen! The girls _____________ “Happy new year” in the next room.