【題目】Elephants _____carry wood by people long time ago.

A. was trained B. trained to C. train to D. were trained to

【答案】D

【解析】句意：很久以前大象被人們訓(xùn)練搬運木頭。這是被動語態(tài)的結(jié)構(gòu)be + 過去分詞，根據(jù)long time ago.用過去時態(tài)，主語是復(fù)數(shù)，所以用were；train to do sth訓(xùn)練做某事。故選D

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