It is said that sixty percent of all energy ________ in the world today is being lost as waste heat.
A．producedB．producing
C．to produceD．having produced
A
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(dòng)詞作定語，被修飾詞energy與produce之間是邏輯上的被動(dòng)關(guān)系，四個(gè)選項(xiàng)中只有A項(xiàng)表示被動(dòng)，故選A。
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