单项选择题

A. Too old.
B. Twice a week.
C. 20 kilometers.
D. Two weeks.
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单项选择题
A. At 10:13. B. At 10:30. C. At 10:00. D. At 12:30.
A. At 10:13. B. At 10:30. C. At 10:00. D. At 12:30.
单项选择题
Some people have nothing to eat, ______ others eat too much.
A. until
B. unless
C. while
D. if
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