单项选择题

We didn''t finish the work in time. You _______us since you were there.

A． might help
B． should help
C． could have helped
D． must have helped
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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
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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