单项选择题

Father asked Jack ______ he had stayed out so late.

A． how
B． when
C． why
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单项选择题
He feels lonely. He has ______ friends here except me.
A． few
B． little
C． some
单项选择题
This book should be returned to the library ______ the end of this month.
A． by
B． from
C． in
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