All possible means ____, but nothing can prevent the buildings ____.[    ]

A. has tried; from being pulled down    

B. have tried; from pulling down

C. has been tried; from pulling down          

D. have been tried; from being pulled down

硫酸阿托品注射液（）

A.零售企业凭盖有医疗单位公章的医生处方限量供应

B.实行专库（柜）、双人、双锁保管

C.两者均需

D.两者均不需