高考英语从句题I prefer shutting myself in and listening to music al

高考英语从句题I prefer shutting myself in and listening to music all day on Sundays.
-I prefer shutting myself in and listening to music all day on Sundays.
-That’s _______ I don’t agree .You should have a more active life.
A.where B.how C.when D.what
我知道这里agree作vi,所以选A
那如果是agree on,是不是前面就是what啊?