单项选择题

Victor promised to keep his boss ______ what was going on in the factory.

A．lo be informed
B．informing of
C．inform about
D．informed of
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单项选择题
They are put lo work when young, and they stay ______.
A．to
B．down
C．up
D．put
单项选择题
In me he found an ______ listener, who, by virtue of book reading, knew much about the sea-life he had lived.
A．appreciative
B．appreciate
C．appreciated
D．appreciating
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