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A．A little less than six hundred billion dollars.
B．Six hundred billion dollars.
C．More than six hundred billion dollars.
D．About six hundred billion dollars.

A.A
B.
B．Six
C.
C．More
D.
D．About

【参考答案】

C
解析：对应文中倒数第二句，赤字已经超过600亿美元。
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