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In many cases without delivery confirmation the sender knows that something was sent

继续教育 公共英语 已帮助 人

In many cases, without delivery confirmation, the sender knows that something was sent, but there is no confirmation ___ whether was received or when it was received.

A、in terms of

B、as to

C、in this regard

热搜：在公制与英制换算中,1in等于()。