If we throw away too much waste and can’t keep good ecosystem,we _________ our futureA.must have destroyedB.could be destroying C.may be destroyingD.must destroy
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C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。