题目内容
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
B
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。
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。
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