I was supposed to all my shopping by now, but I still have a great many to buy. A. to ha

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(答案→)A. to have finished
B. to finish
C. to be finishing
D. to have been finished
解析：考查非谓语动词。到如今我本应该已经买了我所有的东西，但是我仍旧有很多东西要买。Be supposed to被期望，后面接动词原形，如果不定式动作发生在谓语动词前，则用不定式的完成时态，故选A。答案中去掉一个to更为恰当。