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—Jane, have you finished your paper?
—No, I ________ my sister with her drawing all the morning.
A.helpB.helpedC.was helpingD.have been helping
D

試題分析:考查時態(tài)。本題的關鍵詞是后面的時間狀語all the morning該詞與現在完成進行時連用,表示動作從過去開始一直持續(xù)到現在,還在發(fā)生。句意:—Jane,你寫完論文了嗎?—沒有,整個早晨我都在幫助我的姐姐在畫畫。故D正確。
點評:時態(tài)題的考查關鍵是抓住句子的上下文含義和句中的時間狀語。要根據時間狀語來選擇合適的時態(tài),在平時的學習中要注意積累有關時態(tài)的用法和各種時態(tài)的特殊之處。如since, so far等經常與現在完成時連用。在條件狀語從句中用一般現在時代替將來時等等。
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