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About 35% of the rubbish in HongKong can be recycled every year       the rest can’t.
A. then         B. while                C. since
B

试题分析:句意:每年在香港大约35%的垃圾被回收利用,而剩余的都没有能回收利用。根据句意可知,这两句话之间是转折的关系,这里的while 的意思是然而;then 是一个副词,意为:然后;since 意思是自从,或既然。根据句意可知选B。
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