单项选择题

The primitive weapon ______ from that country as it could not be traced back to any other origin.

A．must be introduced
B．must have been introduced
C．might be introduced
D．might have been introduced
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单项选择题
It is no good trying to ______ the consequences caused in the damage.
A．calculate
B．compute
C．maximize
D．minimize
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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