请选择CBA8E(i,]6R;r In the library, you must _____.(U9c(i't8y/w/[;V,w8?2Z
A. be quiet(U9c(i't8y/w/[;V,w8?2Z
B. eat(U9c(i't8y/w/[;V,w8?2Z
C. watch(U9c(i't8y/w/[;V,w8?2Z