I was almost asleep last night when I suddenly heard someone ______ at the door.

游客2023-09-22 87

问题 I was almost asleep last night when I suddenly heard someone ______ at the door.

选项 A、be knocking
B、knocking
C、to knock
D、having knocked

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。

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