John thinks it won't be long _____ he is ready for his new job. [ ]

A. when

B. after

C. before

D. since

鼻咽癌的发病与哪种病毒感染有关()

A．人 * * 状病毒

B．EB病毒

C．疱疹病毒

D．腺病毒

E．流感病毒