16．John is as good as his word．         he makes a promise，he will keep it．（　�。�
A．BeforeB．WhileC．AlthoughD．Once

分析 約翰是個言而有信的人．一旦他做出了承諾，他就會堅持．

解答 答案D．
before"在…之前"，引導時間狀語從句．while表示"當…的時候"，引導時間狀語從句；意為"盡管、雖然"，引導讓步狀語從句；意為"而、但是"，引導比較狀語從句．although"盡管，雖然"，引導讓步狀語從句．once"一旦"，引導時間狀語從句．"he makes a promise"和"he will keep it"之間是邏輯上的"時間"關系，可排除C項；再聯(lián)系句子所表達的意思可知A和B意思不通順，故答案選D．

點評 本題考查從屬連詞的用法．連詞的用法辨析，要注意分析主從句之間的邏輯關系，再確定相應的連詞，同時注意不同的連詞的語義及用法區(qū)別．

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