We are sorry ______ the trouble the printer has caused you, but we are confident that it can be fixed ______ your complete satisfaction.

【参考答案】

for，to[解析] 句意：对于这台打印机给您带来的不便，我们深感抱歉，但我们坚信可以把它修理到让您百分之百满意。be ......

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