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After 15 years in the USA, he finally decided to ________ American citizenship.
A．concentrate onB．a(chǎn)pply for
C．put offD．lead to
B

試題分析：A. concentrate on全神貫注于，B. apply for申請(qǐng)，  C. put off推遲，D. lead to導(dǎo)致，句意：--在美國(guó)15年后，他最后決定申請(qǐng)美國(guó)公民。根據(jù)句意選B。
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