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
When and where _______ you _________ the bag? —- Oh, yesterday in my desk.
_____ people are there in your town? —One hundred thousand.[ ]
Today, there are still 40 _______ children needing help for education.
There was a little trouble but______ things were soon quiet.[ ]
Hello! May I speak to Kate? — Sorry, she isn’t here now. She __________to Shanghai.