C
that of public health是表语从句,this不可以做表语从句的引导词的.that of public health是表语从句，咋没有先行词呀？并不是所有的从句都要先行词的。这句话主语:One of the most important question they had to consider系动词:was表语（从句）：that of public health
One of the most important question they had to consider was ____of public health.
One of the most important question they had to consider was ____of public health.
A.what B.this C.that D.which
为啥this不行
A.what B.this C.that D.which
为啥this不行
英语人气：241 ℃时间：2019-11-02 05:41:19
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