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题型：单选题 题类：常考题 难易度：普通
新目标版英语八年级下册 Unit 5 What were you doing when the rainstorm came？（Section A）
-I was in my room __________ my homework.
点拨：{#blank#}1{#/blank#}意为"当……时候"，后面通常接时间点，从句中谓语动词用短暂性动词。另外，while，意为"当……时候"， 后面只能接一段时间，不能接时间点，其引导的从句的动作或状态往往与主句的动作同时发生。
While we were walking home, it began to rain.＝ {#blank#}2{#/blank#}
一Impossible．He the lights with me at the Guangzhou International Light Festival(广州国际灯光节)。
—Sorry, I the exchange students around our school then.
—Sorry, sir. Ms Wang {#blank#}1{#/blank#} (explain) a Maths problem to me.
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