3.Noise disturbance （ ） harmful in ChinaA：didn’t use to be considered B：usedn’t to considered C：didn’t used to consider D：aren’t used to consider 选那一个正确的答案

3.Noise disturbance （ ） harmful in ChinaA：didn’t use to be considered B：usedn’t to considered C：didn’t used to consider D：aren’t used to consider 选那一个正确的答案
3.Noise disturbance （ ） harmful in China
A：didn’t use to be considered
B：usedn’t to considered
C：didn’t used to consider
D：aren’t used to consider
选那一个正确的答案

3.Noise disturbance （ ） harmful in ChinaA：didn’t use to be considered B：usedn’t to considered C：didn’t used to consider D：aren’t used to consider 选那一个正确的答案
选a
use to be/do 过去常常
这里的噪音应该是被考虑,所以用被动 be considered
b c 没用被动
D的话就是be used to do 意思是被用来做.显然也不对