I planned to see you last week, but I was ill.A. to have comeB. to come　C. to be comingD.

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A. to have e
B. to e
　
C. to be ing
(答案→)D. to have been ing
解析：句意，我上周打算去看你，但是我生病了。planned＋to have＋过去分词，表示过去本计划做，但没有成功。根据but I was ill，可知我打算去，但是没去成，故选D。