At school，some students are active ________ some are shy，yet they can be good friends with one another. (2012·四川，4)
| A．while | B．although |
| C．so | D．as |
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At school，some students are active ________ some are shy，yet they can be good friends with one another. (2012·四川，4)
| A．while | B．although |
| C．so | D．as |
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