单项选择题

We have received your letter of September 12, ______ we are glad to know that you are interested in our electric heaters.

A．which
B．at which
C．with which
D．from which
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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
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
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