单项选择题

It was the old man______ has reported the fire.

A．that
B．which
C．who
D．since
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单项选择题
-- ______could I keep these books -- One month.
A．How often
B．How much
C．How long
D．How many
单项选择题
The boy wanted to ride his bicycle in the street, but his mother told him______.
A．not to
B．not to do
C．not do it
D．do not
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