单项选择题

Your firm has been recommended to us by AMK company, （） we have done business for many years.

A.with whom
B.with who
C.whom
D.who

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We find （）necessary to stress the importance of making punctual shipment within the validity of the L C.

A.how
B.that
C.it
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We regret （） that we can’t accept your offer.

A.of saying
B.for saying
C.about saying
D.to say
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