an appropriate age.children are encouraged.but not forced.to leave the nest ．( )A．ReachB．Upon reachingC．To reachD．Upon arriving 题目和参考答案——青夏教育精英家教网—

题目内容

17．______ an appropriate age，children are encouraged，but not forced，to"leave the nest"．（　　）

A．

Reach

B．

Upon reaching

C．

To reach

D．

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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