6．-Jane，have you finished your paper？
-No，I ______ my sister with her homework all the morning．（　�。�
A．helpB．was helping
C．helpedD．have been helping

分析 -簡，你的論文寫好了嗎？
-還沒，我一上午都在幫我妹妹輔導(dǎo)家庭作業(yè)．

解答 答案：D
題干中all the morning一上午，表示help的動作持續(xù)發(fā)生；對話中表達(dá)的是help my sister with her homework all the morning造成的結(jié)果是我的論文沒寫好，表示過去的動作對現(xiàn)在的影響或結(jié)果，是完成時態(tài)的用法．故選D．

點(diǎn)評 現(xiàn)在完成進(jìn)行時表示動作從某一時間開始，一直持續(xù)到現(xiàn)在，或者剛剛終止，或者可能仍然要繼續(xù)下去．

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