It is extremely urgent that they________from the destroyed building before dark.

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问题 It is extremely urgent that they________from the destroyed building before dark.

选项 A、must rescue
B、be rescued
C、will be rescued
D、shall be rescued

答案B

解析 在“It is/was appropriate/important…+主语从句”句型中,从句要用虚拟语气,即从句的谓语动词应用“should+动词原形”的形式,should可以省略。另外,they和rescue(营救)之间是逻辑上的动宾关系,应用被动语态,所以空处应用(should)be rescued。故选B。
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