【題目】I was just about to go to sleep______ there was a loud knock on the door.

A. while B. when C. as D. since

【答案】B

【解析】

試題分析：句意：我正要去睡覺(jué)，這時(shí)候有很大的敲門(mén)聲。此處的連詞含有“正在那時(shí)”之意，與be about to連用，故選B。

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