题目内容

___is certain is ___prevention is more important than treatment .
A．It;that B．What;that C．As;whatD．What;what
B
B “____is certain”在句中做主语,主语从句缺少一个主语,需要用What; “___prevention is more important than treatment .”系表语从句,句意与结构完整,只有that,可以这样用。
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