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【题目】While she ________, someone knocked at the door.

A.typedB.was typingC.is typingD.types

【答案】B

【解析】

句意:当她正在打字时,有人敲门。

本题主要考查过去进行时的用法。A. typed一般过去时;B. was typing过去进行时;C. is typing现在进行时; D. types一般现在时;while当…时,type延续性动词;后句动词knocked为一般过去时。根据句意表示当她正在打字的时候,有人敲门。故要用过去进行时,其构成为was/ were doing。故选B

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