It is extremely urgent that they ______ from the mountain before dark.A、must be

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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

解析在句型“It is urgent/necessary/important+从句”中，从句中要用虚拟语气，其构成是：should do，可以将 should省略。

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