The lady was so absorbed in her job that she didn't hear a customer ________ at the door.
A．to knockB．knocking
C．be knockedD．knocked
B
答案：B　考查非謂語動(dòng)詞。句意：這位女士如此專注于她的工作以至于她沒有聽到有位顧客正在敲門。hear sb. doing sth.聽到某人正在做某事。
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