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
Among the five boys, Tony made______ progress.
A． the least
B． the less
C． the little
单项选择题
Usually______ are not very careful in doing exercises.
A． boy students
B． boys students
C． boy's students
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