很明显,这是一个定语从句,定语从句的连接词不能是what,所以不能选D；而在从句中主、谓、宾都不缺,因而是缺少一个用作状语的连接词,经过分析,只有选C说的过去.
NOW there is a system ____the waste is diaposed of using the
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