______ he was ill I was expected to take his place greatly surpried me for I didn’t have much work experience.

A．If

B．If that

C．That

D．That if

联锁表是根据车站信号（）展示的整个站场的线路、道岔、信号机、轨道区段的情况，按照规定的原则和格式编制出来的。