应在沥青面层上浇洒沥青黏层的是()。

A.需加铺磨耗层的旧沥青路面

B.有裂缝的旧沥青路面

C.需加铺磨耗层的新建沥青路面

D.需加铺沥青面层的旧有沥青路面

It is believed that a new kind of drug ______ by the scientists and they are hopeful that they

will succeed in a couple of months.      [ ]

A. has been developed  

B. is being developed  

C. is developing  

D. has developed