One of the most important questions they had to consider was _____ of public health.
A．whatB．this
C．thatD．which
C
考查代詞。分析句子結(jié)構(gòu)可看出they had to consider是定語從句，可見was是系動詞，根據(jù)選項可判斷后面不是句子，不需要疑問詞，排除A和D。通過句子結(jié)構(gòu)的分析空格應(yīng)是指上文的question這個名詞。語法告訴我們that指上文，而this指下文。句意是“他們不得不考慮的最重要的問題之一就是公眾健康的問題”。
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