Elephants_?carry wood by people long time ago.A.was trained B.trained to C.train to D.were trained to

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Elephants_?carry wood by people long time ago.
A.was trained B.trained to C.train to D.were trained to

选 D,很久以前,大象被人们训练来搬运木材.
long time ago很久以前,过去式,大象被训练,所以用过去式被动
to carry wood 不定式作目的状语.