单选题 The minerals boom has brought about an economic boom, which in turn has meant that real estate values have ______ to record levels.

【正确答案】 C

【答案解析】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。