21、One of the most important questions they had to consider was      of public health

A. what                                                                B. this

C. that                                                                 D. which

21、C

解析：考查代詞及其含義，由語意：他們必須面臨的其中一個問題就是公共衛(wèi)生問題，只有that,可以代替the problem.

請在這里輸入關(guān)鍵詞：
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