printround（998.88，0），round（999.99，-1）执行结果是：（）A、999.00，990.00B、999.00，1000.00C、998.00，1000.00D、999.00，999.99
printround（998.88，0），round（999.99，-1）执行结果是：（）
- A、999.00，990.00
- B、999.00，1000.00
- C、998.00，1000.00
- D、999.00，999.99
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