[单选题]We have to point out that the postponement of the fulfilment of the contract（）caused us certain expenses.

正确答案 ：C

has

[单选题]We have received your letter of September 12，（）we are glad to know that you are interested in our electric heaters.

正确答案 ：C

from which

[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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