Along with the email was my brother’s promise I came first in the competition he would b

问题补充：

Along with the email was my brother’s promise I came first in the competition, he would buy me an MP4.

A. what

B. that

C. that if

D. whether

答案：

A. what

B. that

(答案→)C. that if

D. whether

解析：考查名词性从句。that引导同位语从句，if为同位语从句中的条件句。故选C。