I _____ to get there before seven tomorrow, so I'll have to get up early. [ ]

A. told

B. have told

C. will tell

D. was told

葡萄球菌水解后，用沉淀法可获得的具有种属特异性的完全抗原是 （）

A.多糖抗原

B.蛋白抗原

C.菌体抗原

D.鞭毛抗原

E.荚膜抗原