31．—Can you tell me what time the flight to Detroit leaves? —I'm sorry but it ．A. has bee

问题补充：

31．—Can you tell me what time the flight to Detroit leaves?

—Im sorry, but it ．

A. has been canceled

B. had been canceled

C. has canceled

D. had canceled

答案：

(答案→)A. has been canceled

B. had been canceled

C. has canceled

D. had canceled

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