单项选择题

We regret having to remind you that 20% of the freight is still ______.

A．paying
B．owning
C．outstanding
D．understanding
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单项选择题
______ you probably know, a routine credit investigation is the usual procedure before new accounts are opened.
A．Because
B．Since
C．As
D．While
单项选择题
We thank you for your letter of May 5th______ your purchase from us of 5,000 tons of green beans.
A．confirm
B．to confirm
C．confirming
D．confirmed
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