---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候完成的？結合語境可知下文指的是過去某時發(fā)生的動作，故用一般過去時態(tài)，選B。
點評：英語中的時態(tài)主要是借助于時間狀語與上下文語境來進行判斷。解答此類題型，首先要注意句子中的時間狀語，如果沒有則要通過分析上下文，結合語境來判斷句子的時態(tài)。
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