单选题 It might be the case that the economy is fundamentally unchanged from where it was a year or two ago, but has received a boost from the falling cost of petrol and other commodities.
【正确答案】 A
【答案解析】解析：题干中that引导的是主语从句。主语从句又由but连接的两个小分句组成。句子成分完整，条理清晰。因此本句是正确的。即应选A项。