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(shí)候交上你的讀書(shū)報(bào)告？
--抱歉，我不確定．我還沒(méi)有寫(xiě)完．

解答 答案：D．
根據(jù)語(yǔ)境結(jié)合設(shè)空處后面的yet推測(cè)答語(yǔ)的句意是"抱歉，我不確定．我還沒(méi)有寫(xiě)完．"，強(qiáng)調(diào)對(duì)現(xiàn)在的影響，所以用現(xiàn)在完成時(shí)．現(xiàn)在完成時(shí)的構(gòu)成是：主語(yǔ)+have/has+動(dòng)詞的過(guò)去分詞；變否定句在have/has后面直接加not 故答案為D．

點(diǎn)評(píng) 本題考查了動(dòng)詞的時(shí)態(tài)．做題時(shí)，一定要特別關(guān)注有關(guān)的時(shí)間短語(yǔ)，這是判斷句子時(shí)態(tài)的標(biāo)志．在沒(méi)有時(shí)間狀語(yǔ)的情況下可以聯(lián)系上下文根據(jù)語(yǔ)境來(lái)做出正確判斷．

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