题目内容
【题目】__________ is certain is __________ prevention is more important than treatment.
A. It; that
B. What; that
C. As; what
D. What; what
【答案】B
【解析】__________ 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. 是表语从句,句意与结构完整,只有that可以这样用。
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