Even a drop of water ______because it is so important to all the living things.

A．must wasteB．must be wasted
C．mustn’t wasteD．mustn’t be wasted

D

解析這題考查情態(tài)動詞的被動語態(tài)的用法，“情態(tài)動詞+be+done”，句意是：一滴水都不能浪費，因為它對每個生物都是有用的，注意用否定式。

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