单项选择题

Do you remember ________ you have given this box to

A． what
B． how
C． whom
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单项选择题
--Must I turn off the light when I leave--NO,________
A． you mustn’t
B． you can’t
C． you needn’t
单项选择题
A heavy stone ________ his foot.
A． fell on
B． knocked down
C． fallen down
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