【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(dāng)我做作業(yè)時(shí)，我的媽媽正在掃地。

考查動(dòng)詞時(shí)態(tài)辨析。is sweeping現(xiàn)在進(jìn)行時(shí)；was sweeping過(guò)去進(jìn)行時(shí)；sweeping現(xiàn)在分詞；has swept現(xiàn)在完成時(shí)。when引導(dǎo)時(shí)間狀語(yǔ)從句，從句中did是一般過(guò)去時(shí)，所以主句用過(guò)去的某個(gè)時(shí)態(tài)。根據(jù)句意，原句表示“昨晚當(dāng)我做作業(yè)時(shí)，我的媽媽正在掃地”，表示過(guò)去某個(gè)時(shí)間動(dòng)作正在進(jìn)行，所以空格處填過(guò)去進(jìn)行時(shí)was sweeping。故選B。

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