单项选择题

When you are travelling ______, you often need to stay in a hotel.

A．if on business or for pleasure
B．whether on business or for pleasure
C．whether business or pleasure
D．on business or pleasure
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单项选择题
Territorial ______ was the Rome Empire's principal consideration in making policy decisions.
A．increase
B．expansion
C．extension
D．enlargement
单项选择题
You can think a situation ______ this Chinese idiom is used then you can understand it better.
A．when
B．where
C．how
D．which
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