[单选题]In many cases, without delivery confirmation, the sender knows thatsomething was sent, but there is no confirmation ___whether was received or when it was received.
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2023-10-01 08:01:11
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[单选题]In many cases, without delivery confirmation, the sender knows thatsomething 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
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