【题目】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: 飞机什么时候起飞已经宣布了吗？此处是when引导的主语从句，故选D
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Has it been announced ?A.when are the planes to take offB.that are the planes to take offC.where are
编辑：chaxungu时间：2026-04-27 03:13:47分类：高中英语题库
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