附加题：贺 圆 密 葫 趣
根据商标法的规定，不能用作注册商标标志的有（ ）
A．文字
B．数字
C．图形
D．产品通用名
Great Expectations ______ my favorite book, which ______ by Charles Dickens, and ______ as classic literature nowadays.
A．is; was written; is seen
B．are; are written; are seen
C．is; had been written; is seen
D．are; were written; is being seen
