2. 外语
  3. It is vital that you ______ quickly to whatever is said.

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

admin2009-05-28  13
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/a pity+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。[例句] It is necessary that he (should) come to our meeting tomorrow．他明天来参加我们的会议是必要的。
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