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2.I ________ a topic for the composition,but haven't decided yet.(  )
A.will think aboutB.have been thinking about
C.had thought aboutD.was thought about

分析 我一直在考虑这篇作文的主题,但是我还没有决定.

解答 答案的B.本题考查完成进行时;现在完成进行时表示在与现在相联系的段时间内一直在进行没有间断的动作,并且暗示动作还在进行中;由题干中的"haven't decided yet"判断考虑的动作一直在进行,并且还在考虑中,故选B.

点评 对时态的选择,要在把握时态的基本用法的基础上,根据具体语境和题干中的时间推断时态,同时关注特殊的结构.

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