高等继续教育 / 电子商务英语
正确率：100%
题型描述: 单选题
The letters ＿＿＿＿＿＿that morning.
A.delivered
B.had been delivered
C.were delivered
D.was delivered
The letters ＿＿＿＿＿＿that morning.
A.delivered
B.had been delivered
C.were delivered
D.was delivered
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