[讨论]请教一道语法题

2002.10 语法11题

11.         over 100 years since the invention of the square-bottomed paper bag.

(A)  Now is

(B)  Now it has

(C)  There is now

(D)  It is now

此题明显缺少主语和谓语，但c和d哪个是对的，有什么说法吗?