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题型:单选题 题类:易错题 难易度:普通

仁爱科普版九年级上Unit 4 Amazing ScienceTopic 2 I’m excited about the things that will be discovered in the f

The train _____ because of an accident; many passengers are now waiting anxiously at the railway station.

A、has been delayed B、delayed   C、has delayed D、had been delayed
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