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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

这题考查情态动词的被动语态的用法,“情态动词+be+done”,句意是:一滴水都不能浪费,因为它对每个生物都是有用的,注意用否定式。
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