妊娠高血压综合征孕妇头痛剧烈伴呕吐时首选药物是（）。

A.硫酸镁静脉滴注

B.哌替啶肌内注射

C.肼苯达嗪静脉滴注

D.甘露醇快速静脉滴注

E.阿托品静脉注射

— We did not see him at the lecture yesterday．

— You _______ him, since I went to an international conference with him．

A．mustn’t have seen

B．can’t have seen

C．couldn’t see

D．needn’t have seen