when+has+it+ever+been…汉语
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咨询记录 · 回答于2022-03-02
when+has+it+ever+been…汉语
1. It be +时间段＋before...过了多长时间才。。。。。。：It was two days before he knew.过了两天他才知道。It was three years before he came back from abroad. 过了三年他才从国外回来。2. It be+ 时间点 ＋when... 当。。。。。。时候，时间是。。。。。。：It was six when he arrived.当他到达时，时间是6点钟。3. It is / has been +时间段 ＋since...(往往用非延
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