请选择DCBA(B1l8i2W9o7}.X9C1S(B You should _________ in the library.2`)^4X6W8Y6d(m
A. be quiet2`)^4X6W8Y6d(m
B. quiet2`)^4X6W8Y6d(m
C. be noisy2`)^4X6W8Y6d(m
D. noisy2`)^4X6W8Y6d(m