【題目】Now there is a system the waste is disposed of using the principles of ecology.

A. when B. that

C. where D. what

【答案】C

【解析】考查定語從句。句意：現(xiàn)在這有一套體系：廢物可以使用生態(tài)的原則被處理掉。a system是先行詞，它在定語從句中做抽象的地點(diǎn)狀語，因此選C。

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