i usually watch TV ( ) rainy days 括号里是on还是in 为什么i usually watch TV ( ) rainy days 括号里是on还是in 为什么

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i usually watch TV ( ) rainy days 括号里是on还是in 为什么i usually watch TV ( ) rainy days 括号里是on还是in 为什么

i usually watch TV ( ) rainy days 括号里是on还是in 为什么i usually watch TV ( ) rainy days 括号里是on还是in 为什么
i usually watch TV ( ) rainy days 括号里是on还是in 为什么
i usually watch TV ( ) rainy days 括号里是on还是in 为什么

i usually watch TV ( ) rainy days 括号里是on还是in 为什么i usually watch TV ( ) rainy days 括号里是on还是in 为什么
on
因为rainy days是具体的某天,前面要用on

in 在雨天 固定搭配

on在具体的天都用on,In 一般用于年月,以及上下午晚上

用介词on,

on rainy days
eg
On rainy days, they sink to their knees in putrid water.
CNN: TRASH ENTREPRENEURS
The retired worker usually waters his garden every day except on rainy days.