【題目】My mother ________ the floor when I did my homework last night.

A.is sweepingB.was sweepingC.sweepingD.has swept

【答案】B

【解析】

句意：昨晚當我做作業(yè)時，我的媽媽正在掃地。

考查動詞時態(tài)辨析。is sweeping現(xiàn)在進行時；was sweeping過去進行時；sweeping現(xiàn)在分詞；has swept現(xiàn)在完成時。when引導時間狀語從句，從句中did是一般過去時，所以主句用過去的某個時態(tài)。根據(jù)句意，原句表示“昨晚當我做作業(yè)時，我的媽媽正在掃地”，表示過去某個時間動作正在進行，所以空格處填過去進行時was sweeping。故選B。

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