20．I happened to be ______ when the gunman was shot dead the moment he was _______ by the police．I was disgusted to see his clothes covered with blood spots（　�。�
A．on the spot； spottedB．on the spot； watched
C．in the spot； seenD．at the spot； noticed

分析 持槍歹徒一被警察看到就被槍擊致死時我碰巧在場．我看到他的衣服滿是血斑感到惡心．

解答 答案：A 考查介詞短語．第一空：on the spot意為"立即，當場"；第二空：spot意為"看出，認出"．根據(jù)句意，A項正確．

點評 考查介詞短語，弄清楚各個介詞短語的含義并區(qū)別各個介詞短語之間的差異，了解某些介詞短語的特殊用法，然后結合語境選擇正確答案．

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