单项选择题

The Niagara Falls_______long been a popular tourist destination, boosted by a number of movies. ( )

A．have
B．having
C．had
D．haven’t
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单项选择题
You have not at all read my points carefully and_______the same mistakes. ( )
A．continuously repeat
B．continuously repeated
C．are continuously repeating
D．continuously repeating
单项选择题
There are stores on_______sides of the square. ( )
A．both
B．every
C．each
D．all
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