摘要： One of the most important questions they had to consider was of public health A. what B. this C. that D. which 答案 C 解析 句意为:他们必须考虑其中最重要的问题是公共卫生.考查that作代词.that 作代词.往往用于特指.相当于“that+名词 .它也只能代替事情不能代替人.

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