单项选择题

As the plane was getting ready to take off, we all （）our seat belts.

A. tied
B. fastened
C. locked
D. attached

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We regret （）you that the goods you ordered are out of stock.

A. to tell
B. telling
C. having told
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Can you tell me （）about the novel that makes people like reading it so much

A. it is what
B. what is it
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D. is it what
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