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when the old man _ to walk to his house,the sun_ itself behi

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when the old man _ to walk to his house,the sun_ itself behind the mountain.
A.started,had already hidden B.had started,had already hidden C.had started,was hiding D.was starting,hid
when the old man _ to walk to his house,the sun_ itself behi
A正确.首先看全句,大体意思应该是老人转身时,太阳已经落到山下.第一空明显是started.那么第二空为什么不是用hid,而要用完成时呢?因为太阳的运转是客观的,太阳不会像一个人一样,看到老人往回走它立马落下去.而且太阳落山是一个漫长的过程,不可能一下子落下去,此时用一般过去时就不太好.