题目内容

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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