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14.It hasn't been announced _____ the plane is to take off.(  )
A.whereB.whenC.howD.why

分析 飞机何时起飞还没有通知.

解答 答案:B  题干中前面说的是It hasn't been announced 这件事还没通知,后面接的是the plane is to take off飞机起飞,可以知道与飞机起飞相关的应该是起飞时间,要用连接副词when什么时候.故选B.

点评 在句子中起名词作用的各种从句统称为名词性从句.根据它们在句中的语法作用,这类从句又可分为主语从句、同位语从句、表语从句和宾语从句. 本题中it充当了形式主语,when引导的主语从句是真实主语.

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