10．---When will you hand in your book report？
----Sorry，I'm not sure．I      writing it yet．（　　）
A．didn't finishB．don't finish
C．hadn't finishedD．haven't finished

分析 --你什么時候交上你的讀書報告？
--抱歉，我不確定．我還沒有寫完．

解答 答案：D．
根據(jù)語境結(jié)合設(shè)空處后面的yet推測答語的句意是"抱歉，我不確定．我還沒有寫完．"，強調(diào)對現(xiàn)在的影響，所以用現(xiàn)在完成時．現(xiàn)在完成時的構(gòu)成是：主語+have/has+動詞的過去分詞；變否定句在have/has后面直接加not 故答案為D．

點評 本題考查了動詞的時態(tài)．做題時，一定要特別關(guān)注有關(guān)的時間短語，這是判斷句子時態(tài)的標志．在沒有時間狀語的情況下可以聯(lián)系上下文根據(jù)語境來做出正確判斷．

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