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We really regret unable to inform you of the meeting. [ ] A. have been B. having

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We really regret unable to inform you of the meeting. [ ] A. have been B. having

We really regret ___________ unable to inform you of the meeting.

[    ]

A. have been  B. having been

C. to have been   D. to having been

试题答案

答案：B

标签：unabletoinformwereally

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