They make a promise _they would help us when we had trouble选什么A what B which C thatD why

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They make a promise _they would help us when we had trouble选什么A what B which C thatD why

They make a promise _they would help us when we had trouble选什么A what B which C thatD why
They make a promise _they would help us when we had trouble选什么
A what
B which
C that
D why

They make a promise _they would help us when we had trouble选什么A what B which C thatD why
c

C that
这个是同位语从句,
从句中的句子什么成分都不缺,所以可以用which或that
但是,一般情况下都会用that
所以选C

选C ,that 做promise的同位语。
此句翻译为,他们承诺当我们有困难的时候会帮助我们。

C,同位语从句