问题描述：
there is a lot of rain in the south of china in summer
There is a lot of rain in the south of china in summer
it often__ __in the south of china in summer
the rain is often__in the south of china in summer
There is a lot of rain in the south of china in summer
it often__ __in the south of china in summer
the rain is often__in the south of china in summer
问题解答：
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