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【题目】I think bicycles are much safer than other vehicles. (改为否定句)
I think bicycles much safer than other vehicles.

【答案】don't;are
【解析】句意:我认为骑自行车比其他车辆要安全的多。think跟宾语从句时要用否定前移的形式,即主句用否定,从句用肯定。所以答案是don't; are。

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