Question

the reason why he hasn't come

33.The reason__he hasn't come is___he has to send his mother to a hospital
A why /
B which that
C why that
D that why
句子分析,

Answer 1

答案：C
why引导定语从句,修饰前面的reason.后面是that引导的表语从句,作is的表语.
翻译：他没有来的原因是因为他得送他妈妈去医院.