单项选择题

I felt somewhat disappointed and was about to leave, ______ something occurred which attracted my attention.

A. unless
B. until
C. when
D. while
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单项选择题
______ there is little we can do to modify the wheat here, we can at least know what kind of weather to expect.
A. Since
B. When
C. While
D. Unless
单项选择题
The truck driver was fined for exceeding the speed ______.
A. range
B. limit
C. rule
D. regulation
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