下列诗文集的命名方式中，其中一项与其他三项不同的是（）。

A.《范文正公集》

B.《王子安集》

C.《徐霞客游记》

D.《文山先生全集》

Ten years ago, the population of our village was________that of theirs. [      ]

A. as twice large as  

B. twice as large as

C. twice as much as  

D. as twice much as