问题
单项选择题
We confirm（）your order No.7891 dated May 10，1990.
A．to have received
B．having received
C．receiving
D．toreceive
答案
参考答案：B
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We confirm（）your order No.7891 dated May 10，1990.
A．to have received
B．having received
C．receiving
D．toreceive
参考答案：B