The police at Denver International Airport examined a bomb threat against a United Airlines flight to San Francisco,____________ the flight for hours.A.delayedB.to delayC.delayingD.had delayed
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C解析试题分析：考查分词，现在分词做状语，名词The police和动词delay是主谓关系，所以用现在分词做状语，所以选C考点：考查分词
点评：分词是个难点，做分词题时，首先判断名词和动词的关系，由它们的关系确定分词