问题
单项选择题
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
答案
参考答案：B
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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
参考答案：B