If we throw away too much waste and can’t keep good ecosystem,we our future.A. must have

If we throw away too much waste and can’t keep good ecosystem,we our future.
A. must have destroyed
B. could be destroying 
C. may be destroying
D. must destroy 

A. must have destroyedB. could be destroying (答案→)C. may be destroyingD. must destroy 解析：must have destroyed表示对过去确有把握的推测。could be destroying表推测时常用于否定句和疑问句。may be destroying表示可能性,可能我们正在毁灭我们的未来。must destroy一定是,表示确有把握。从题意来看本题的最佳选项是C。

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