译文：

A. Due to the rising cost of raw materials we must raise our price by 3%. (欠妥）

B. Due to the rising cost of raw materials we have to raise our price by 3% . (较好）

C. Due to the rising cost of raw materials we are reluctantly compelled to raise our price by 3% .(最好）

而技术英语为了表达客观公正的效果多用被动语态，例如：

(3) Several approaches to the problem of ladle skull slag or deoxidation-scum removed was being tried. (罐内结壳，熔渣或脱氧浮渣清除问题的几项解决方案正在试验中。）用句子交际分析的观点来看上例，被动语态的句子最重要的持征之一，就是位于句首的被动句主语是陈述的出发点。也就是说，动作客体表达的是已知信息(given imformation).也就是作者要突出陈述的重点。如果将这些被动句改成SVO句型,则无法达到这个目的和效果。

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