问题补充：
I to go for a walk, but someone called and I couldn’t get away.
A. was planning
B. planned
C. had planned
D. would plan
答案：
A. was planning
B. planned
(答案→)C. had planned
D. would plan
解析：考查虚拟语气：Had planned to do sth本计划做某事却没做；根据后半句的过去时可知是与过去事实相反的虚拟语气。结合句意：我本计划去散步，但有人打电话给我，所以我没走开。可知C正确。
