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17.______ an appropriate age,children are encouraged,but not forced,to"leave the nest".(  )
A.ReachB.Upon reachingC.To reachD.Upon arriving

分析 一到合适的年龄,孩子们就被鼓励,而不是强制,去"离开窝".

解答 答案:B.根据句意,"一到合适的年龄",故用upon,upon后接动名词或名词,reach an appropriate age到合适的年龄,故用upon reaching,故选B.to reach表明目的.

点评 本题考查介词的辨析,学生应根据介词含义及用法选择合适的答案.

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