She was not happy because he had kept her (wait) ______for half an hour. waiting

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问题 She was not happy because he had kept her (wait) ______for half an hour.

选项

答案 waiting

解析 该题考查动词的变化。关键词是句中的keep“使……—直”。由于该动词是延续性动词,其后的动词做宾语补足语时应该用动名词。另外,keep与其他动词构成的搭配往往都是这种结构。如:keep some body waiting“使某人一直等候”;keep doing something“一直在做某事”等。
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