Now there’s a system _________ the waste is disposed of using the principles of ecology.

A．when B．which C．that D．where 

D

解析試題分析：句意：現(xiàn)在有個系統(tǒng)利用生態(tài)學原理處理廢物。這句話用了定語從句，先行詞是a system，定語從句中不缺主賓表，缺少的是地點狀語in the system，所以用where引導定語從句，選D。
考點：考查定語從句

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