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Your friends were all worried over _________you were sick.

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Your friends were all worried over _________you were sick.
A :that B :the fact that
我选的前者,答案是后者,后者为什么对?前者为什么不对?(请大侠详细说明,完全搞懂一个题是非常重要的)
over是介词,后面需要接ing或名词,所以要有the fact,that是用来解释the fact的从句.