It is essential that mankind ______ ways and means to protect the environment.

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问题 It is essential that mankind ______ ways and means to protect the environment.

选项 A、adopt
B、have adopted
C、will adopt
D、will have adopted

答案A

解析 it is essential that句型使用虚拟语气，从句中谓语动词用should+动词原形，或直接用动词原形。

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英语

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