20、It was only several days ______ he realized the truth that he had been affected with AIDS．
A．until B．since C．before D．as
科目：高中英语 来源： 题型：
It was only several days ______ he realized the truth that he had been affected with AIDS．
A．until B．since C．before D．as
科目：高中英语 来源： 题型：
It was only several days ______ he realized the truth that he had been affected with AIDS.
A．before B．since C．until D．as
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