单项选择题

______ ago, there were few people in the world.

A．Thousand (一千，成千上万) years
B．Thousands of years
C．Thousand of years
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Only one of these places is ______.
A．worth visit
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C．worth visiting
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It seems to me that ______ too much rain at this time of the year.
A．it has
B．there is
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