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