A、enabled the car to control its energy flow B、enabled the grip operators to monitor the car’s energy flow C、were provided by PJ

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问题

选项 A、enabled the car to control its energy flow
B、enabled the grip operators to monitor the car’s energy flow
C、were provided by PJM Interconnection for Kempton’s team
D、were custom-designed for Kempton’s team

答案A

解析该段第2句开头的主语They指的是上一句提到的Kempton’s team，该句提到了他们使用了商业软件和硬件，结合上一句的custom-built和本句的这些软件和硬件的功能可以推断Kempton’s team将这些软件和硬件安装到电动车里，以使电动车能控制电池电力的流动方向，以达到为电网供电的目的。因此选A。

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大学英语六级

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A、enabled the car to control its energy flow B、enabled the grip operators to monitor the car’s energy flow C、were provided by PJ

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