_What do you think of the book?_It reminds me of the days()I spent in the countryside.

问题描述:

_What do you think of the book?_It reminds me of the days()I spent in the countryside.
A when B that

选B,days 后面是一个定语从句,用that 引导,that在定语从句中作主语或宾语,这里 I是从句的主语,spent是从句的谓语,that是做spent的宾语.
用when引导,when在从句中作时间状语.
spent明显缺少宾语,所以选that