问题
选择题
I had wanted to help you last night but I couldn’t spare any time．for I_____an essay that is due this morning．
A．wrote
B．had written
C．was writing
D．have written
答案
答案：C
考查时态。句意：我昨晚曾想帮助你来着，但是我腾不出时间。因为我正在写一篇今天上午要交的论文。结合语境可知描述的是过去正在进行的动作，故用过去进行时态，选C。