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  3. (Hardly) (I had) sat down (when) I heard someone (knock) at the door.

(Hardly) (I had) sat down (when) I heard someone (knock) at the door.

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问题 (Hardly) (I had) sat down (when) I heard someone (knock) at the door.
选项 A、Hardly
B、I had
C、when
D、knock
答案B I had→had I
解析 本题考查倒装句。scarcely…when，no sooner…than，hardly…when等否定意义的词放句首时句子用部分倒装。本句中的倒装语序是Hardly+助动词+主语+谓语+其它，所以改为had I。
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