I was so tired that I ______ when I was sitting in the armchair reading.

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问题 I was so tired that I ______ when I was sitting in the armchair reading.

选项 A、dropped away
B、dropped out
C、dropped off
D、dropped through

答案C

解析 drop off指“打瞌睡,睡着”,符合句意:drop away指“减少”;drop out指“(参加比赛等)弃权,(从事或即将从事某项活动等之人)不参与,放弃”;drop through是口语用法,指“毫无结果,不再被讨论”。
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