【題目】I ____my homework when someone knocked at the door.

A. am doingB. was doing

C. did

【答案】B

【解析】

句意:我正在做我的家庭作業(yè),這時(shí)有人敲門。

am doing現(xiàn)在進(jìn)行時(shí);was doing過(guò)去進(jìn)行時(shí);did過(guò)去式。根據(jù)句中when someone knocked at the door可知,這里表示過(guò)去的某個(gè)時(shí)間正在做的事情,應(yīng)用過(guò)去進(jìn)行時(shí),故選B。

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