-----I wonder if you could go with me to the supermarket.
------- Don’t disturb me. I _____________my experiment report all the morning and haven’t finished yet.
A．writeB．was writingC．have writtenD．have been writting
D

試題分析：表示動作從過去某一時間開始一直持續(xù)到現(xiàn)在，并且有可能持續(xù)下去，故用現(xiàn)在完成進行時。
點評：這道題目難度適中，在平時的學習中，認真掌握好各個時態(tài)的用法，不難做出解答。
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