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Food shortage will long be a worldwide problem _______ much has been done to supply enough for everyone.?

A. before B. if?

C. since D. although?

D?


解析:

本题考查状语从句;虽然为满足每一个人的需求做了大量的工作,但食物缺乏仍然是一个长期的问题,所以选although。

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