used to do的用法归纳（used to do的用法）
1、used to do 过去常常(表示现在不再) used to do过去常常，过去曾经;过去常常做某事He used to do his homework on Sunday, but now he often does homework on Saturday.他过去在星期天做家庭作业，但是现在他经常在星期六做作业。 2、eg: I used to swim in the lake...
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RPC for pilotscale experiment was used to do the pilotscale experiment on acetic acid complex extraction process. 采用中试振动筛板萃取塔对醋酸稀溶液的络合萃取过程进行了中试实验研究。 Listing 3 shows the code used to do this....
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