单项选择题

Which is ______ of all the subjects

A． difficult
B． the most difficult
C． more difficult
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单项选择题
Only one of these places is ______.
A． worth visit
B． worth to visit
C． worth visiting
单项选择题
It seems to me that ______ too much rain at this time of the year.
A． it has
B． there is
C． it is
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