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單項(xiàng)選擇題

We would like to take this（）to establish business relations with you.

A.opening
B.opportunity
C.step
D.advantage

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We are sending you the samples（）requested．

A.be
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單項(xiàng)選擇題

（）your Enquiry No.123，we are sending you a catalog and a sample book for your reference.

A.According
B.Asper
C.As
D.About