使淋巴细胞溶解，致淋巴细胞耗竭（）
使肿瘤细胞不能从外界获得其生长所必需的氨基酸（）
抑制雄激素对前列腺生长的刺激作用（）
解救大剂量甲氨蝶呤中毒（）

A.亚叶酸钙

B.地塞米松

C.昂丹司琼

D.氟他胺

E.L-门冬酰胺酶

— Why does the lake smell terrible? 

— Because large quantities of water _________.[ ]

A. have been polluted      

B. has polluted    

C. have polluted          

D. has been polluted