50. The United States of America _____one of the most developed countries in the world.
A. is B. are C. was D. were
KEY:
1-5 BABAA 6-10 CDBDB 11-15 CDABA
16-20 BCBAB 21-25 ABABA 26-30 BADBD
31-35 BDCBC 36-40 ADBBC 41-45 CBBBD
46-50 BBAAA
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版权所有:()