单项选择题

Use of a safety rail will ______ your little kid from falling out of bed at night.

A．delete
B．conclude
C．break
D．prevent
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单项选择题
The ______ at the National Art Gallery features paintings by the famous artist Claude Monet.
A．exhibition
B．concept
C．benefit
D．account
单项选择题
We are planning to emigrate to North America sometime ______ the next couple of years.
A．for
B．from
C．among
D．within
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