If we throw away too much waste and can’t keep good ecosystem,we _________ our future.
A．must have destroyedB．could be destroying ?
C．may be destroyingD．must destroy ?
C?
must have destroyed表示對過去確有把握的推測。could be destroying表推測時常用于否定句和疑問句。may be destroying表示可能性,可能我們正在毀滅我們的未來。must destroy一定是,表示確有把握。從題意來看本題的最佳選項是C。
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