In his letter was his promise （） he would spend the Christma

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/21 10:26:23

In his letter was his promise （） he would spend the Christmas Eve with me
A、that
B、what
C、which
D、whether
为什么用A?为什么其他的不能用?解释一下、并且说明一下是什么从句

这是同位语从句
同位语从句属于名词性从句,大多由从属连词that引导,常常跟在fact,idea,opinion,promise,news,hope,belief等名词后面.同位语从句一般用来解释或说明这些名词的具体含义或内容,在逻辑上表现为同位关系.
what一般是用于从句中缺少成分时,用于充当宾语.which一般情况下可与that替换,但在同位语从句中不可以；另外,在做地点状语时 ,in which 这样的结构等于 where .whether一般都是与or not连用的.

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