The police at Denver International Airport examined a bomb threat against a Unit
题型：不详难度：来源：
The police at Denver International Airport examined a bomb threat against a United Airlines flight to San Francisco,____________ the flight for hours. | A．delayed | B．to delay | C．delaying | D．had delayed |
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答案
| 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
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 |
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