We appreciate your order, ( ) we very much regret that we are unable to accept any fresh orders at present owing to heavy commitments.<br />A. and <br>B.but<br>C.. or <br>D. nor

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题目内容（国家开放大学英语语法）

We appreciate your order, ( ) we very much regret that we are unable to accept any fresh orders at present owing to heavy commitments.
A. and
B.but
C.. or
D. nor

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