90 % of the debts so far.A. is paid backB. have been paid offC. has been paid offD. are p

问题补充：

90 % of the debts so far.

A. is paid back

B. have been paid off

C. has been paid off

D. are paid off

答案：

A. is paid back

B. have been paid off

(答案→)C. has been paid off

D. are paid off

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