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

連詞辨析。Because因為；why為什么； when當……時； if是否，如果。句意：媽媽，我明天上午要動身去北京了。——哦，太好了。但是當你到達北京時一定要給我打電話。結合語境可知選C。