[单选题]Our company has 30years’ experience（）the machinery line.

正确答案 ：B

in

[单选题]While（）an enquiry，you ought to enquire into quality，specification and price etC．

正确答案 ：D

making

[单选题]A 3% discount will be granted only（）your order exceeds US$12，000.

正确答案 ：C

on condition that

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