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

分析 飛機(jī)何時(shí)起飛還沒(méi)有通知．

解答 答案：B  題干中前面說(shuō)的是It hasn't been announced 這件事還沒(méi)通知，后面接的是the plane is to take off飛機(jī)起飛，可以知道與飛機(jī)起飛相關(guān)的應(yīng)該是起飛時(shí)間，要用連接副詞when什么時(shí)候．故選B．

點(diǎn)評(píng) 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?cè)诰渲械恼Z(yǔ)法作用，這類從句又可分為主語(yǔ)從句、同位語(yǔ)從句、表語(yǔ)從句和賓語(yǔ)從句． 本題中it充當(dāng)了形式主語(yǔ)，when引導(dǎo)的主語(yǔ)從句是真實(shí)主語(yǔ)．

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