The kind lady devoted all her life to _____ those homeless children.
A．help B．helpingC．be helpingD．being helped
B

試題分析：考查詞組：devote all one’s life to doing一生致力于做…，這里的to是介詞，后面接動名詞做賓語，句意：這個好心的女士一生都致力于幫助那些無家可歸的孩子。選B。
點評：英語中有的詞組的to不是不定式，而是介詞，如：get down to doing，be used to doing等，要注意多積累這方面的詞組。
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