[单选题]Everyone knows that China’s Bristles are of superior quality（）those from other countries.

正确答案 ：B

to

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

正确答案 ：C

on condition that

[单选题]We（）your letter of Nov.3 asking us to make a quotation.

正确答案 ：C

refer to

[单选题]By law，a buyer should have（）opportunity to change his mind.

正确答案 ：D

adequate

[单选题]Complaint prevailed and this compelled the producer to resolve（）improvements.

正确答案 ：A

on

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