题目内容
【题目】
After 15 years in the USA, he has finally decided to American ______ citizenship.
A. concentrate on
B. apply for
C. look out for
D. appeal to
【答案】B
【解析】句意:在美国15年后,他终于决定申请美国国籍了。concentrate on集中精力于;apply for申请;look out for小心;appeal to呼吁,吸引。
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