One of the most important questions they had to consider was _________ of public health.

A. what B. this C. which D. that

 

D

【解析】

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(yǔ)從句，從句缺少謂語(yǔ)部分，因此不是表語(yǔ)從句，排除A、C；空白處指代的是“那個(gè)重要的問(wèn)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。

考點(diǎn)：考查代詞和從句辨析

 

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