The sentence structure of “Teachers ask me to finish the homework on time.” is _______.

A．S+V+DO

B．S+V+IO+DO

C．S+V+DO+OC

D．S+V+P

霍乱弧菌微生物学检查首选（）

A.涂片革兰染色

B.悬滴法观察细菌动力

C.Sereny试验

D.血清凝集试验

E.霍乱红试验