The lady was so absorbed in her job that she didn't hear a customer at the door.A．to knock B．knockingC．be knocked D．knocked 题目和参考答案——青夏教育精英家教网—

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The lady was so absorbed in her job that she didn't hear a customer ________ at the door.

A．to knock B．knocking

C．be knocked D．knocked

【解析】答案：B　考查非谓语动词。句意：这位女士如此专注于她的工作以至于她没有听到有位顾客正在敲门。hear sb. doing sth.听到某人正在做某事。

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