A. It is the place in which to spend your summer vacation.
B. I wonder the place where we can have fun.
去掉the place将导致语法错误。因为in which to spend...这个结构只能作定语。
the place的出现导致句子结构错误,应该删去。wonder不能后接名词作宾语,宾语只能是疑问分句。
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