14、_______ is known to us all is that there have been five cases of A(H1NI) influenza on the mainland, two of whom have been cured.
A．It B．As C．That D．What
科目：高中英語 來源： 題型：
_______ is known to us all is that there have been five cases of A(H1NI) influenza on the mainland, two of whom have been cured.
A．It B．As C．That D．What
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