[-C21] When the old man _____ to walk back to his house ,the

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[-C21] When the old man _____ to walk back to his house ,the sun _____ itself behind the
mountain.
A.was starting ; hid
B.had start ; had already hidden
C.had started ; was hiding
D.started ; had already hidden
翻译并分析,为什么选D不选B?

翻译：当这个老人开始向家走的时候,太阳已经落山了.
首先B中 had start是不正确的,过去完成时为 had started
其次,过去完成时应用在有一个过去的时间点做参照的情况下,即一个过去时做时间点,才用过去完成时,表示在过去的时间点之前就已经发生.
D中,started用过去时,做过去的时间点

[-C21] When the old man _____ to walk back to his house ,the 填空when the old man ----(开始）to walk back to his house,the sun When the old man ________ to walk back to his house,the sun the old man _____[walk]to the park lost weekend It usually _____ the old man one hour to walk to the park. The old man prefers a house in the country to spend his late The old man often goes to a walk with his dog after dinner.改 The young man started to go back to his room when he stopped .-------no cause for alarm,the old man went back to his bedr ____ no cause for alarm,the old man went back to his bedroom The man was too old to walk fast. the old man came here to visit his old friend