问题
选择题
---When did you learn the news that Obama made a trip to Canada as President?
--- _________ was on my return.
A．That
B．It
C．There
D．This
答案
答案：B
考查强调句型。_________ was on my return是强调句型的省略句，补充完整应是it was on my return that I learnt the news that Obama made a trip to Canada as President.所以选B。