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23. By the time Amy arrived at the airport, her boyfriend's plane______ already.
(A) took off
(B) was taken off
(C) had taken off
(D) was to take off

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ㄚ原 大四上 (2021/06/13)

過去完成式


had + Vpp.


23. By the time Amy arrived at the airpo..-阿摩線上測驗