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One of the most important questions they had to consider was _________ of public health.
A.whatB.this C.whichD.that
D

试题分析:考查代词和从句辨析。如果把was后的部分看作表语从句,从句缺少谓语部分,因此不是表语从句,排除A、C;空白处指代的是“那个重要的问题”,即the question of public health,为避免重复,承前省略了the question,特指用that或the one,故选D。
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