问题: 大学英语2 阶段作业3 系列问题20 需给出详细解释
20.Mary was caught in a traffic jam and by the time she arrived at the airport her father's plane________.
A.took off
B.had already taken off
C.was taken off
D.had already been taken off
解答:
B
睡觉了ＺＺＺＺＺＺＺ
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