3．---When____you_____the new bike？---I_____it for 2days．（　　）
A．did，have，boughtB．did，buy，have had
C．did，buy，have bought   

分析 --你什么時候買的那輛新自行車？
--我買了兩天了．

解答 答案：B．
 根據(jù)問句的題干"你什么時候買的那輛新自行車？"即提問過去的動作開始的時間，所以用一般過去時，這是一個特殊疑問句，應(yīng)借助于助動詞did．前面使用了助動詞，后面的謂語動詞要使用原形buy．答語中，句中的時間狀語for+時段是現(xiàn)在完成時的標志，且句子中的謂語動詞必須是延續(xù)性動詞，現(xiàn)在完成時的構(gòu)成是：主語+have/has+動詞的過去分詞； 動詞buy是一個非延續(xù)性動詞，轉(zhuǎn)換成have之后才可以與時間段連用，表示動作延續(xù)了一段時間，故答案為B．

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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