---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
网友回答
A. That
(答案→)B. It
C. There
D. This
解析：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。