【題目】Has it been announced ______?
A.when are the planes to take off
B.that are the planes to take off
C.where are the planes to take off
D.when the planes are to take off

【答案】D
【解析】句意: 飛機(jī)什么時(shí)候起飛已經(jīng)宣布了嗎？此處是when引導(dǎo)的主語(yǔ)從句，故選D

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