单项选择题

Father asked Jack ______ he had stayed out so late.

A．how
B．why
C．when
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单项选择题
College usually begins on______.
A．the first of September
B．the first', September
C．September one
单项选择题
Among the five boys, Tony made______ progress.
A．the least
B．the less
C．the little
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