I was almost asleep last night when I suddenly heard someone ______ at the door.A.be knockingB.knock

题目简介

I was almost asleep last night when I suddenly heard someone ______ at the door.A.be knockingB.knock

题目详情

I was almost asleep last night when I suddenly heard someone ______ at the door.
A.be knockingB.knockingC.to knockD.having knocked
题型:单选题难度:偏易来源:不详

答案

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。

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