题目内容:
It is implied in Paragraph 2 that the current immigration system in the U. S._______.
A.needs new immigrant categories A.needs new immigrant categories
B.has loosened control over immigrants
B.has loosened control over immigrants
C.should be adapted to meet challenges
C.should be adapted to meet challenges
D.has been fixed via political means
D.has been fixed via political means
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答案解析: