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

分析 飛機何時起飛還沒有通知．

解答 答案：B  題干中前面說的是It hasn't been announced 這件事還沒通知，后面接的是the plane is to take off飛機起飛，可以知道與飛機起飛相關的應該是起飛時間，要用連接副詞when什么時候．故選B．

點評 在句子中起名詞作用的各種從句統(tǒng)稱為名詞性從句．根據(jù)它們在句中的語法作用，這類從句又可分為主語從句、同位語從句、表語從句和賓語從句． 本題中it充當了形式主語，when引導的主語從句是真實主語．

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