题目内容
After 15 years in the USA, he finally decided to ________ American citizenship.
| A．concentrate on | B．apply for |
| C．put off | D．lead to |
B
解析试题分析：A. concentrate on全神贯注于，B. apply for申请， C. put off推迟，D. lead to导致，句意：--在美国15年后，他最后决定申请美国公民。根据句意选B。
考点：考查动词短语
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