【題目】One of the most important questions they had to consider was of public health

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

【答案】C

【解析】句意為:他們必須考慮其中最重要的問(wèn)題是公共衛(wèi)生?疾閠hat作代詞, that 作代詞, 往往用于特指, 相當(dāng)于 “that+名詞”, 它也只能代替事情不能代替人。

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