单项选择题

Safety glasses are used ______ protecting your eyes.

A．from
B．by
C．to
D．for
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单项选择题
Many students ______ in spite of the difficult conditions.
A．carry out
B．carry on
C．carry off
D．carry forward
单项选择题
The boss told his secretary to ______ the documents for later use.
A．put away
B．turn on
C．make up
D．break out
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