i _____to visit you,but was stopped from doing so

题目

i _____to visit you,but was stopped from doing so
A had wanted B want C have wanted D would want
为什么选A

答案

want（想要）这个动作的发生是在“过去的过去”——"was stopped（被制止）" 这个动作发生在过去,want发生在“was stopped"之前.当动作发生在“过去的过去”时,需要用过去完成时,即 "had wanted".