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英语
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英语求助Has it been announced when the planes are to take off求句子成分分析
人气:126 ℃ 时间:2020-04-10 01:25:10
解答
when前面为现在完成时的被动形式时疑问句,it 作为形式主语,announced 是动词(被动形式).when后面引导时间状语从句,planes主语,are to为“be to do ”句式,表“将要”.take off 动词组.整句为:飞机将要起飞的时候,它已经播报了吗?
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