I had wanted to help you last night but I couldn't spare any time, for I＿＿＿a position which I have to hand in this morningA.wroteB.was writingC.had writtenD.have written
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B解析试题分析：考查时态：句意：昨天晚上我本来想帮助你的，但是我腾不出时间，因为我正在写一篇今天早上要交的作文。因为是昨天晚上正在做…，用过去进行时，选B。考点：考查时态