Question

---Mum, I’m leaving for Beijing tomorrow morning.
--- Oh, good. But be sure to phone me _______ you get to Beijing, please.

A．because

B．why

C．when

D．if

Answer 1

C

连词辨析。Because因为；why为什么； when当……时； if是否，如果。句意：妈妈，我明天上午要动身去北京了。——哦，太好了。但是当你到达北京时一定要给我打电话。结合语境可知选C。