15．They built many tall buildings in Ordos last year．（改為被動語態(tài)）
Many tall buildingswere built in Ordos by them last year．

分析 去年他們在鄂爾多斯建造了許多高的建筑物．
去年在鄂爾多斯許多高建筑物被建成．

解答 答案：were built．原句中的built得知是一般過去時，改為被動語態(tài)的結構是：主語+was/were+過去分詞+by+賓語．主語是buildings是復數(shù)，故were，bulid的過去分詞是built．故答案是were built．

點評 此題要求把主動語態(tài)變?yōu)楸粍诱Z態(tài)，做這類題時，首先由原句的謂語確定采用哪種被動語態(tài)結構，再看主語，二者結合即可得出答案．

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