It is extremely urgent that they ______ from the mountain before dark.

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问题 It is extremely urgent that they ______ from the mountain before dark.

选项 A、must be rescued
B、should rescue
C、can be rescued
D、be rescued

答案D

解析虚拟语气。在"It is urgent/necessary/important+从句”句型中，从句要用虚拟语气should do，should可以省略。

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成人本科学位英语

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