问题
选择题
After living twenty years in the USA，Mary finally decided to ______ American citizenship.[ ]
A. concentrate on
B. apply for
C. look out for
D. appeal to
答案
答案：B
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After living twenty years in the USA，Mary finally decided to ______ American citizenship.[ ]
A. concentrate on
B. apply for
C. look out for
D. appeal to
答案：B