It can be inferred from the context that 'overhauling' (Line 1, Para. 11) has the closest meaning to______.
A．cleaning thoroughly
B．catching up with
C．changing to improve
D．stopping using

A.
A．cleaning
B.catching
C.changing
D.stopping

【参考答案】

C
解析：根据题干中的overhauling将本题出处定位到倒数第二段。该段提到，但是目前大约有20个州正在ov......

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