【題目】Tom's mother heard a knock on the door while she _______ in the kitchen.
A.cooked
B.was cooking
C.is cooking
D.cooks

【答案】B
【解析】句意:湯姆的媽媽正在廚房做飯的時候聽見門上的敲擊聲。while正當……的時候,表示動作的延續(xù),通常用進行時態(tài)。由前文的heard是一般過去時可知此處用過去進行時,所以答案是B。

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