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14．No one believed his reason for being late ______ he was caught in a traffic jam，which made him embarrassed．（　�。�
A．thatB．whyC．whereD．whether

分析 沒人相信他是因為交通擁堵而遲到的理由，這讓他很尷尬．

解答 答案：A  題干中he was caught in a traffic jam是解釋reason的內容，是一個同位語從句；句意表達的是事實，要用that來連接．故選A．

點評 在句子中起名詞作用的各種從句統稱為名詞性從句．根據它們在句中的語法作用，這類從句又可分為主語從句，同位語從句，表語從句和賓語從句．

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