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They would put it beside bed at night,on the seat when(.)in

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They would put it beside bed at night,on the seat when(.)in a car or on a bus.
A.Sit B.sat C.sitting D.would sit选什么?为什么?
C 为省略成分 .when they are sitting .
再问: 可是不是主过从过吗??而且你是怎么判断省略了they are??求解~谢谢
再答: 用would 不代表过去呀 ,较委婉些而已。 they are sitting 表示当时的状态。 还有 ,即便是would 这里就表过去,那么后面相应的就可以是 they were sitting . 其他选项都不对