I was almost asleep last night when I suddenly heard someone ______ at the door.
题型：不详难度：来源：
I was almost asleep last night when I suddenly heard someone ______ at the door.| A．be knocking | B．knocking | C．to knock | D．having knocked |
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答案
| B |
解析
| 本题考查对动词习惯用法的掌握。 hear sb. doing sth．意为听见某人正在做某事。 |
举一反三
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