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

正确答案是：

标签： hard , scientists , working

同类题型

There’re students in Grade7.

Go along this street and turn right. Taizhou Library is on your left. You can’t _______ it

Is there _____ in today’s paper?

My parents _________ at home on weekends.

people visit the museum every day.