问题

To prevent the air _ ,something will have to _.

A:to pollute…take
B:from being polluted be done
C:to be polluted…be taken
D:from polluted… be done

正确答案是：

同类题型

The new teacher referred to________to our school yesterday.

You speak very good French!——–Thanks .I _____ French in Sichuan University for four years.

We should consider the students’ request________ the school library should provide more books on popular science

It’sbeliefthin Chinanowadays．

Can you think of some cases___________students know clearly he should listen to the teacher but can’t do that ?