单项选择题

Linda feels exhausted because she _______so many visitors today.

A． has been having
B． had been having
C． was having
D． had had
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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
单项选择题
Rain does not _______bring down the temperature.
A．necessarily
B．certainly
C．undoubtedly
D．completely
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