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（）you probably know， a routine credit investigation is the usual procedure before newaccounts are opened.
（）you probably know， a routine credit investigation is the usual procedure before newaccounts are opened.
A、Because
B、Since
C、As
D、While
正确答案：C
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After receiving our request for payment extension， our supplier agreed to draw a new bill（） us， with interest of 5% added for extension.
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For exporters，we usually ask our buyers to open letters of credit（） seller' s documentarydrafts at sight.