____is certain is ___prevention is more important than treatment .
A．It;that B．What;that C．As;whatD．What;what
B
“____is certain”在句中做主語,主語從句缺少一個主語,需要用What; “___prevention is more important than treatment .”系表語從句,句意與結(jié)構(gòu)完整,只有that,可以這樣用
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