---I have finished my homework already, Mum.
--- When ________ you ________ it?
A．did; finishedB．did; finish
C．have; finishedD．were; finishing
B

試題分析：句意：媽媽，我已經(jīng)完成了我的家庭作業(yè)�！闶裁磿r(shí)候完成的？結(jié)合語(yǔ)境可知下文指的是過(guò)去某時(shí)發(fā)生的動(dòng)作，故用一般過(guò)去時(shí)態(tài)，選B。
點(diǎn)評(píng)：英語(yǔ)中的時(shí)態(tài)主要是借助于時(shí)間狀語(yǔ)與上下文語(yǔ)境來(lái)進(jìn)行判斷。解答此類題型，首先要注意句子中的時(shí)間狀語(yǔ)，如果沒(méi)有則要通過(guò)分析上下文，結(jié)合語(yǔ)境來(lái)判斷句子的時(shí)態(tài)。
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