The minerals boom has brought about an economic boom, which in turn has meant th

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问题 The minerals boom has brought about an economic boom, which in turn has meant that real estate values have______to record levels.

选项 A、rose
B、raised
C、risen
D、been raising

答案 C

解析本题需正确区分及物动词raise和不及物动词rise。to record levels(创纪录的水平)并非宾语，而是表示程度的状语，因此横线处需填入不及物动词。因横线前有表示现在完成时的have，故选(C)risen。

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Themineralsboomhasbroughtaboutaneconomicboom,whichinturnhasmeantth