题目内容

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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