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I could see toys here and there on the floor___a child had b

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I could see toys here and there on the floor___a child had been playing there.
A as if b where c when d which
为什么选A不选B?
因为主句是一般过去时
从句式过去完成时
那说明从句发生在主句的过去
where引导状语从句 除了当地点状语的情况 多是伴随状语
as if是虚拟语气 从句时态往后退一层