[单选题]Directions: In this part there is a sentence with four choices marked A, B, C and D. Choose the one that best completes the sentence.Last Sunday he made a promise that （ ） he was free he would take me to Beijing for a visit.
A
if
B
when
C
that if
D
whether
正确答案：A
题目解析
分析句子可知that引导的后面的从句为promise的内容。分析that后面的同位语从句中“he was free”是“he would take me to Beijing for a visit”的条件，结合句意可以确定使用if引导条件状语从句，故选A。
句意：上星期天他答应我，如果他有空，他就带我游览北京。
