[求助]請問一道文法題

deepocean101

. __ 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

答案是d，但我想請問 b 為什麼不行啊?

cpcjustin

"it "indicates not clearly

farsuccess

it有两种句式，强调和形式主语。

选b, 后面没有be，就不是强调，是形式主语，你看句义就不对了