ABC Limited is a private company limited by shares, which has adopted Table A as its articles of association. The authorised and issued share capital of ABC Limited is EUR 10,000 divided into 5,000 Class ‘A’ shares of EUR 1 each and 5,000 Class ‘B’ shares of EUR 1 each. Class ‘A’ shares enjoy preferential rights over dividends and repayment of capital. Mary holds 4,000 Class ‘A’ shares and 4,000 Class ‘B’ shares; Tim holds 500 Class ‘A’ shares and 1,000 Class ‘B’ shares; and John holds 500 Class ‘A’ shares. Mary wishes to remove the preferential rights attached to Class ‘A’ shares but Tim opposes.Required:Advise Tim. (10 marks)

对细菌叶酸代谢呈双重阻断的是（）.

A.磺胺类药+甲氧苄啶 

B.棒酸+阿莫西林 

C.依那普利+利尿药 

D.亚胺培南＋西拉司丁 

E.氟尿嘧啶＋醛氢叶酸