问题
选择题
I _______ to help you but I was not able to spare any time.I _______ a paper last night and I'll have to finish it today.
A．wanted; have been writing
B．have wanted;wrote
C．had wanted; wrote
D．had wanted;was writing
答案
D
考查动词的时态。第一空表“本想干某事但却未干成”,应用过去完成时。第二空指过去某时正在进行的动作。