单项选择题

Get the invoice ______upon receipt.

A． signature
B． sign
C． signed
D． signing
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单项选择题
The proposal was submitted ______April 28.
A． at
B． the
C． on
D． from
单项选择题
Mr. Daley is our most skilled speaker; ______, he is unavailable to give the presentation.
A． besides
B． nevertheless
C． for example
D． while
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