--- May I speak to your manager Mr. Williams at five o’clock tonight?

--- I’m sorry. Mr. Williams        to a conference long before then.

A．will have gone

B．had gone

C．would have gone

D．has gone

肠穿孔常发生在伤寒病程的()

A．第一周

B．第二周

C．第三周

D．第四周

E．潜伏期