Mother made a promise I passed the college entrance examination she would buy me a mobil

问题补充：

Mother made a promise I passed the college entrance examination she would buy me a mobile phone.

A. that

B. if that

C. that if

D. that whether

答案：

A. that

B. if that

(答案→)C. that if

D. that whether

解析：名词promise后是同位语从句，用that引导；if引导条件状语从句。