One of the most important problems they had to consider was________of public health.
A.whatB.thisC.thatD.which
C
C [句意:他們必須考慮的最重要的問題之一是大眾健康。句中缺少表語,且指代上文one of the most important problems,所以應用that。what和which不能用作替代詞,而this作代詞時指代下文。]
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