【选择】40.They expressed the hope（ ）they would come to visit China.
问题描述：
【选择】40.They expressed the hope（ ）they would come to visit China.
（which / that / whether / what）
这道题选什么.理由是.
答
选that
原因：that引导的是同位语从句,起到 hope的追加说明作用
也就是hope=they would come to visit China.
翻译下,
他们表达了他们会来到中国的愿望.