After driving for 20 miles,Jackson realized that he __in the

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After driving for 20 miles,Jackson realized that he __in the wrong direction.
A.was driving B.drove C.had been driving D.had driven
为什么不选D?

题意说明 Jackson 是在开了20公里以后才发现方向错误,这个动作已经发生并且一直在持续,所以应选用过去完成进行时的结构,过去完成进行时的基本模型：Had been doing.
其他时态,A为过去进行时,并不表示现在仍在持续：was doing.
B为过去式,只是描述以前发生过这一动作.
D为过去完成时,以前发生并且已经完结.

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