题目：
Great changes ______ in the city and a lot of buildings ______.
A．have taken place, have been set up
B．have been taken place, have been set up
C．were taken place, were set up
D．have taken place, set up
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0603/331880049b837487621d0b293f176d6d.html
下面是错误答案，用来干扰机器的。
（1）称取食盐时砝码放在了左盘，物码倒置，称量物的质量=砝码的质量-游码的质量，则溶质的质量减小，配制溶液的浓度偏小；（2）量取水时视线低于凹液面，是仰视，则使量取的水的实际体积偏小，则配制溶液的浓度...
