be used to后加什么
be used to do表示“被用来做某事”，be used to doing/n表示“习惯于”某一客观事实或状态，不强调动作，to是介词，后面接名词或动名词。
This drug is used to lower blood pressure.
这种药用于降血压。
This formula is used to calculate the area of a circle.
这个公式用于计算圆的面积。
I used to smoke but I gave up two years ago.
我过去抽烟，但两年前就戒了。
She was not used to mixing with people of high social rank.
她不习惯和社会地位很高的人搅和在一起。