We regret that it is necessary to complain（）the non-delivery of the10，000 tons of sugar under Contract BC-023.
- A、concerning
- B、about
- C、regarding
- D、with
正确答案:B
答案解析:有
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外销员
外销员
We regret that it is necessary to complain（）the non-delivery of the10，000 tons of sugar under Contract BC-023.
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