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

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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

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
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

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
C
that of public health是表语从句,this不可以做表语从句的引导词的.

D
复原 : Which of public health was One of the most important question they had to consider
Which 代替 One of the most important question they had to consider 一整句话