1.One of the most important questions they had to consider was____of public healh.A.what.B.this C.that.D.which 为什么选C啊

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1.Oneofthemostimportantquestionstheyhadtoconsiderwas____ofpublichealh.A.what.B.thisC.that.D.which为什么

1.One of the most important questions they had to consider was____of public healh.A.what.B.this C.that.D.which 为什么选C啊
1.One of the most important questions they had to consider was____of public heal
h.
A.what.B.this C.that.D.which
为什么选C啊

1.One of the most important questions they had to consider was____of public healh.A.what.B.this C.that.D.which 为什么选C啊
首先,was之后不是从句,所以不能选从句引导词what和which;
其次,that为指代词,其可换成天the one,为避免重复,故用that指代,而this无此用法

固定句型

that在这里是代词,指代上面的One of the most important questions 。this一般用于引起下文