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

分析 一到合適的年齡，孩子們就被鼓勵，而不是強制，去"離開窩"．

解答 答案：B．根據(jù)句意，"一到合適的年齡"，故用upon，upon后接動名詞或名詞，reach an appropriate age到合適的年齡，故用upon reaching，故選B．to reach表明目的．

點評 本題考查介詞的辨析，學(xué)生應(yīng)根據(jù)介詞含義及用法選擇合適的答案．

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