One of the most important questions they had to consider was ____ of public health.
A. what B. this C. that D. which
One of the most important questions they had to consider was ____ of public health.
A. what B. this C. that D. which
C
句意: 他们必须考虑的最重要的问题之一就是公众健康问题。此题考查的是that的指代用法, that在此等于the question。