_______isknowntousallisthattherehavebeenfivecasesofA(H1...
来源：语文精选馆 1.89W
问题详情：
_______ 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
【回答】
D知识点：主语从句
题型：选择题
