----------the robot is very useful to us,we should treat it correctlyA、As a result B、Although C、But D、In order to

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----------the robot is very useful to us,we should treat it correctly
A、As a result B、Although C、But D、In order to

although

这个机器人非常有用,我们应该正确使用。
Because the robot is very useful to us,we should treat it correctly.

选B.从useful和correctly这两词来看,可知主从句的关系应为转折关系。

in order to do ,in order to不能跟句子。