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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 我一直在考慮這篇作文的主題，但是我還沒有決定．

解答 答案的B．本題考查完成進行時；現(xiàn)在完成進行時表示在與現(xiàn)在相聯(lián)系的段時間內一直在進行沒有間斷的動作，并且暗示動作還在進行中；由題干中的"haven't decided yet"判斷考慮的動作一直在進行，并且還在考慮中，故選B．

點評 對時態(tài)的選擇，要在把握時態(tài)的基本用法的基礎上，根據具體語境和題干中的時間推斷時態(tài)，同時關注特殊的結構．

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