单项选择题

Gunpowder was used extensively in firearms prior to 1990.

A．in
B．around
C．from
D．before
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It's tough looking for a job these days.
A．different
B．digital
C．difficult
D．direct
单项选择题
During his lifetime he was able to accumulate quite a fortune.
A．control
B．spend
C．collect
D．exchange
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