l made a promise( )my son passed the exam.l would take him to the zoo.a.that if b.if c.that

问题描述:

l made a promise( )my son passed the exam.l would take him to the zoo.a.that if b.if c.that
d.whether

答案选a.that if
that是引导一个同位语从句,that后的句子修饰promise.if引导条件状语从句.