She to go traveling this summer, but some extra work took up all her time.
A. had been planned
B. has planned
C. was planned
D. had planned
网友回答
A. had been planned
B. has planned
C. was planned
(答案→)D. had planned
解析：考察时态。句意：她本打算这个夏天去旅行，但是一些额外的工作占据了她所有的时间。可知前文描述的是在过去某个时间已经完成的动作，故用过去完成时态，她是计划这个动作的发出者，故不用被动语态，选D。