单项选择题

(Advertising) gives useful information about (which) (products) (to buying).

A．A
B．B
C．C
D．D
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单项选择题
The information (which) she (was injured) in (the accident) (was given) by Liz.
A．A
B．B
C．C
D．D
单项选择题
(Research shows) that employees (whose) obtain (satisfaction) from their jobs are more (productive).
A．A
B．B
C．C
D．D
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