It is said that sixty percent of all energy ________ in the world today is being lost as waste heat.

A．produced B．producing

C．to produce D．having produced

 

A

【解析】A　句意：據(jù)說現(xiàn)在世界上被生產(chǎn)的所有的能源中有百分之六十都被作為余熱丟失掉了。本題考查非謂語動詞作定語，被修飾詞energy與produce之間是邏輯上的被動關(guān)系，四個選項(xiàng)中只有A項(xiàng)表示被動，故選A。

 

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