第7题: [单项选择]The first city in the United States that put into effect major plan for the clustering of government buildings was Washington, D.C.
参考答案:B 答案解析:答案:B
分析:首先注意的是put sth. into effect这个习语是"使…实施"的意思,而在这句话中sth是“major plan…buildings”,它太长了,所以为了句子的平衡起见,