单项选择题

The story happened ______ the night of Oct. 20,1939.

A．at
B．for
C．on
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单项选择题
-- You haven't lost your key, have you-- ______.
A．I hope so
B．I think not
C．I hope not
单项选择题
______ did you spend on these books
A．How many money
B．How much
C．How many
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