高等继续教育 / 经贸英语
正确率：100%
题型描述: 单选题
We regret _ _ _ _ _ unable to agree to the buyer's request as stated in the L/C stipulations for insurance to be covered up to the inland city.
A.to have been
B.to be
C.being
D.been
We regret _ _ _ _ _ unable to agree to the buyer's request as stated in the L/C stipulations for insurance to be covered up to the inland city.
A.to have been
B.to be
C.being
D.been
参考答案：
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