We are pleased to confirm the e-mails _______ us as per copies attached. A. exchanged between B. exchange between C. exchanges between D. having exchanged between

We are pleased to confirm the e-mails _______ us as per copies attached.

A.
exchanged between

B.
exchange between

C.
exchanges between

D.
having exchanged between

出自：甘肃开放大学英语阅读1

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