【題目】The students ________ their homework when the teacher came in.

A.doB.didC.are doingD.were doing

【答案】D

【解析】

句意:當(dāng)老師進(jìn)來(lái)時(shí),學(xué)生們正在做作業(yè)。

本題考查時(shí)態(tài)。do一般現(xiàn)在時(shí),did是一般過(guò)去時(shí),are doing是現(xiàn)在進(jìn)行時(shí),were doing是過(guò)去進(jìn)行時(shí)。when引導(dǎo)的時(shí)間狀語(yǔ)從句用的是一般過(guò)去時(shí),主句用過(guò)去進(jìn)行時(shí)。故選D。

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