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

試題分析：考查代詞和從句辨析。如果把was后的部分看作表語從句，從句缺少謂語部分，因此不是表語從句，排除A、C；空白處指代的是“那個重要的問題”，即the question of public health，為避免重復(fù)，承前省略了the question，特指用that或the one，故選D。
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