Sam has been appointed _____ manager of the engineering department to take _____ place of George.

A．/; /

B．the; /

C．the; the

D．/; the

药物过敏性口炎并发皮肤病损的特征性临床表现是

A．糜烂

B．溃疡

C．渗出多，形成灰白色假膜

D．疼痛明显

E．虹膜状红斑