单项选择题

The relationship between employers and employees has been studied（）.

A．originally
B．extremely
C．violently
D．intensively

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单项选择题
You have nothing to （） by refusing to listen to our advice.

A．gain
B．grasp
C．seize
D．earn
单项选择题
When travelling, you are advised to take travellers'checks, which provide a secure （）to carrying your money in cash.

A．substitute
B．selection
C．preference
D．alternative
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