The number of the students in our school now _____ that of ten years ago. Which of the following is wrong? [ ]

A. has doubled

B. is double

C. is twice as large as

D. is twice as much as

下列哪组药物治疗肺痈最佳（）

A.金银花、黄芩

B.鱼腥草、芦根

C.蒲公英、菊花

D.浙贝母、益母草