It is necessary that something urgent _______ to combat smuggling.

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问题 It is necessary that something urgent _______ to combat smuggling.

选项 A、is done
B、be done
C、has to be done
D、must be done

答案B

解析 考查虚拟语气。在“It+be+a.+that从句”中,that引导的主语从句谓语动词常用“(should)+动词原形”。用于该句型的形容词有necessary,important,urgent,essential,imperative,appropriate,advisable,desirable等。
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