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。