我们做了一份关于镇上图书馆的读者调查 We did a survey of our readers ___ lidraries in our town

我们做了一份关于镇上图书馆的读者调查 We did a survey of our readers ___ lidraries in our town
我们做了一份关于镇上图书馆的读者调查 We did a survey of our readers ___ lidraries in our town

我们做了一份关于镇上图书馆的读者调查 We did a survey of our readers ___ lidraries in our town
We did a survey of our readers _using/patronizing__ libraries in our town