单项选择题

A．an
B．another
C．other
D．some
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单项选择题
A．lessonB．classC．courseD．curriculum
A．lesson
B．class
C．course
D．curriculum
单项选择题
A．By the next day.B．On the hour.C．Within an hour.D．Before six.
A．By the next day.
B．On the hour.
C．Within an hour.
D．Before six.
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