We regret that it is necessary to complain（）the non-delivery of the10，000 tons of sugar under Contract BC-023.<br>A:concerning<br>B:about<br>C:regarding<br>D:with

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

出自：外经贸英语

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