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
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