单项选择题

These students are so busy with their lessons that they go to big department stores once in a while.

A．in no time
B．now and then
C．then and there
D．all at once
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单项选择题
In the course of harsh training, the athletes are frequently told to hold out until they win the championship.
A．stand firm
B．stay awake
C．speak loud
D．shut up
单项选择题
Many of these young kids have to go through with their assignment before being allowed out.
A．endure
B．finish
C．demonstrate
D．allocate
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