问题补充:
One of the most important questions they had to consider was of public health
A. what
B. this
C. that
D. which
答案:
A. what
B. this
(答案→)C. that
D. which
解析:句意为:他们必须考虑其中最重要的问题是公共卫生。考查that作代词,that 作代词,往往用于特指,相当于“that+名词”,它也只能代替事情不能代替人。
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