Along the letter was the promise he decided to help us with our work.A. what B. whichC. t

问题补充：

Along the letter was the promise he decided to help us with our work.

A. what

B. which

C. that

D. it

答案：

A. what

B. which

(答案→)C. that

D. it

解析：考查同位语从句。同位语从句he decided to help us with our work.解释the promise的内容。结合句意可知C正确。句意：随着那封信得是他的诺言，那就是他决定帮助我们的工作。