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  3. The scientist hopes that humans________many difficult problems before entering the next century.

The scientist hopes that humans________many difficult problems before entering the next century.

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问题 The scientist hopes that humans________many difficult problems before entering the next century.
选项 A、will have solved
B、have solved
C、would solve
D、solve
答案A
解析 分析句子结构可知，hopes后面是一个that引导的宾语从句。根据句意和句中的时间状语before entering the next century(在进入下个世纪之前)可知，从句应用将来完成时，即从句谓语动词用“will/shall have+过去分词”的形式，表示在将来某动作发生之前已经完成的动作。故选A。
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