In his letter was his promise () he would spend the Christmas Eve with meA、thatB、whatC、whichD、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

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In his letter was his promise () he would spend the Christmas Eve with meA、thatB、whatC、whichD、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
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

In his letter was his promise () he would spend the Christmas Eve with meA、thatB、whatC、whichD、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.

这是标准的同位语从句
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。

A、that-------引导同位语从句

显然,括号后是promise的具体内容,解释了promise,因此he would spend the Christmas Eve with me 是同位语从句,同位语从句只能用that引导,选A。