2．I can't go out to play because I______my homework yet．（　�。�
A．don't finishB．won't finish
C．didn't finishD．haven't finished

分析 我不能出去玩因為我還沒有完成作業(yè)．

解答 答案：D．
根據(jù)I______my homework yet，可知這里yet表示已經(jīng)的意思，一般用在現(xiàn)在完成時的否定句和疑問句中，所以句子使用現(xiàn)在完成時；現(xiàn)在完成時的結(jié)構(gòu)：主語+have/has+過去分詞+其它；它的否定形式為have/has not+過去分詞+其它，在這里主語是I，所以應(yīng)該使用have，再根據(jù)I can't go out to play because I______my homework yet，可知這里的意思是我不能出去玩因為我還沒有完成作業(yè)，強調(diào)對于現(xiàn)在造成的影響，這里應(yīng)該用現(xiàn)在完成時的否定形式，故選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(biāo)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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