问题描述：
网上的砖家答得不对啊?
the young boy has come to himself in hospital now .but he _____unconscious for three days.
A、has been B、was C、had been
为什么选B不选A呢,
the young boy has come to himself in hospital now .but he _____unconscious for three days.
A、has been B、was C、had been
为什么选B不选A呢,
问题解答：
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