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
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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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