单项选择题

Isn't it time you _________ some serious work before the examination

A．get down to
B．took up with
C．got off with
D．put down to
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单项选择题
Whenever possible, he _________ how well he speaks English.
A．shows around
B．shows off
C．shows out
D．shows up
单项选择题
The last half of the nineteenth century _________ the steady improvement in the means of travel.
A．has witnessed
B．witnessed
C．is witnessed
D．has been witnessed
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