单项选择题

Don't respond to any e-mails ______ personal information, no matter how official they look.

A．searching
B．asking
C．requesting
D．questioning
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单项选择题
As a librarian, she spends most of her time ______ books on the shelves every day.
A．arranging
B．selling
C．controlling
D．borrowing
单项选择题
To overcome the difficulty they were faced with, several companies ______ to form a big one.
A．linked
B．united
C．joined
D．connected
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