问题
选择题
In the last six to nine months，teens in the US to text messaging in numbers twice that in Europe and Asia．
A．took
B．have taken
C．had taken
D．would take
答案
答案：B
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In the last six to nine months，teens in the US to text messaging in numbers twice that in Europe and Asia．
A．took
B．have taken
C．had taken
D．would take
答案：B
