I was almost asleep last night when I suddenly heard someone （）_at the door. ( 章节：1 难度：2)
- A、be knocking
- B、knocking
- C、to knock
- D、having knocked
正确答案:B
答案解析:有
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I was almost asleep last night when I suddenly heard someone （）_at the door. ( 章节：1 难度：2)
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