[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.
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2023-10-01 08:02:45
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[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 be
B.being
C.to have been
D.been
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