I had wanted to help you last night but I couldn't spare any time, for I ________ a composition which I have to hand in this morning.
A．wroteB．was writing
C．had writtenD．have written
B
B 考察動詞時態(tài)。句義:昨天我本想去幫助你，但我實在抽不出時間，因為當時我正在寫作文，作文今天早上必修上交。根據(jù)語境可知此處表示過去某一時刻或某一階段正在進行或者發(fā)生的動作。故使用過去進行時。故B正確。
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