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：句意：我本打算去散步，但是有人打电话，我走不开。Had planned to do或planned to have done本打算做却没做，是一种虚拟语气，选C。
