单项选择题

No sooner had we reached the top of the hill __________ we all sat down to rest.

A．until
B．when
C．then
D．than
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单项选择题
There is no doubt __________ you will pass the exam this time. You have worked so hard in the past months.
A．whether
B．that
C．if
D．what
单项选择题
Lisa was busy taking notes __________ Mark was searching the Internet for information.
A．until
B．unless
C．while
D．if
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