单项选择题

At that time，we did not fully grasp the significance of what had happened．

A．give
B．attach
C．understand
D．lose
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单项选择题
The writer’s purpose of writing this article is to advise people（）

A．to buy mobile phones．
B．to update regular phones．
C．to stop using mobile phones．
D．to use mobile phones less often．
单项选择题
65（）

A．form
B．set
C．cover
D．break
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