为什么要用钥匙打开书 cabinet?
A. Keys are not needed to open a book cabinet.
B. Keys are not necessary to open a book cabinet.
C. Keys are needed to open a book cabinet.
D. Keys are needed to open a book cabinet.
A. Keys are not needed to open a book cabinet.
B. Keys are not necessary to open a book cabinet.
C. Keys are needed to open a book cabinet.
D. Keys are needed to open a book cabinet.