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

C


解析:

could 表示推測時用于疑問句或否定句;must 用于肯定句,不用將來時;would 表示過去將來,或者過去的意愿。may 表示“或許”,語氣不是很肯定。

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