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. 选项 A: to be B: being C: to have been 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.
选项
A: to be
B: being
C: to have been
D: been

出自：英语写作

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