问题

The teacher told us that everyone has an importantrole ________in protecting the earth from________.
A:to play topollute
B:to be playedto be polluted
C:to playbeing polluted
D:to be playedbeing polluted
B:to be playedto be polluted
C:to playbeing polluted
D:to be playedbeing polluted
正确答案是:
同类题型
Did you have a good vacation– . I enjoyed myself with my family on the beach.
We have been informed that he had done_____ visits were essential by eleven o’clock last night. [ ]
1Please stop talking . Our teacher has __________ to tell us.
The bomb______at 11:15 a.m. and killed 36 persons altogether.