【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: 飛機什么時候起飛已經(jīng)宣布了嗎?此處是when引導的主語從句,故選D

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