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I was reading attentively in my own room _____ suddenly he knocked at the door.

A. when
B. while
C. then
D. as
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I was reading attentively in my own room ________ suddenly he knocked at the door.

A.when

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C.then  

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I was reading attentively in my own room _____ suddenly he knocked at the door.
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I was reading attentively in my own room ________ suddenly he knocked at the door.

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I was reading attentively in my own room ________ suddenly he knocked at the door.

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科目:高中英语 来源:2010年吉林省长春外国语学校高二第一次月考英语卷 题型:单选题

I was reading attentively in my own room ________ suddenly he knocked at the door.

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