It is vital that you ______ quickly to whatever is said.

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问题 It is vital that you ______ quickly to whatever is said.

选项 A、respond
B、responded
C、will respond
D、are responding

答案A

解析 主语从句中的虚拟语气。“It is demanded/necessary/apity+that…”结构中的主语从句的谓语动词要用should+动词原形,should可省略。常见的形容词或过去分词有:important,necessary,natural,strange,suggested,ordered, proposed,required,demanded,requested,insisted等。
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