11．-Mr．Smith was really helpful when you were in financial difficulty during those years．
-Definitely．I can never appreciate his kindness ________．（　　）
A．seriouslyB．wellC．enoughD．properly

分析 句意：--史密斯先生在你有經(jīng)濟(jì)困難的這些年真的幫助了你．-的確，我對(duì)與他的友善再怎么感謝都不為過．

解答 答案C． 本題考查的是情態(tài)動(dòng)詞的固定用法，can't…too/can never…enough 表示再…也不為過，越…越好，根據(jù)句意，史密斯先生對(duì)我的幫助，我再怎么感謝也不為過．故選C．

點(diǎn)評(píng) 本題考查情態(tài)動(dòng)詞的用法，要掌握一些習(xí)慣性的搭配，并結(jié)合具體的語境選出正確答案．

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