If time permits, guests will______visit the waterfalls on the island or explore the botanical gardens.

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问题 If time permits, guests will______visit the waterfalls on the island or explore the botanical gardens.

选项 A、either
B、since
C、not only
D、unless

答案A

解析与空格后的or一起构成相关连词either A or B(A和B中任一)结构的(A)either为正确答案。作为参考，either…or…连接助动词will后的动词短语visit the waterfalls与explore the botanical gardens。

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