单项选择题

I''ll lend you my computer _______you promise to take care of it.

A． unless
B． as
C． while
D． if
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单项选择题
Rain does not _______bring down the temperature.
A．necessarily
B．certainly
C．undoubtedly
D．completely
单项选择题
The manager of the company insisted that all the staff members _______the new safety rules.
A． would observe
B． observe
C． observed
D． will observe
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