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
Would you like a cup of coffee first, ______ shall we get down to business right now
A．then
B．when
C．or
D．otherwise
单项选择题
-- ______could I keep these books -- One month.
A．How often
B．How much
C．How long
D．How many
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