单选题

The first step in listing possible causes of each trouble is to show what sections of the system may be at fault.

AA. To show what sections of the system may be at fault, listing possible causes of each trouble is the first thing we should do.

BB. What sections of the system may be at fault depends on the first step in listing possible causes of each trouble.

CC. To show what sections of the system may be at fault is the first step when you list possible causes of each trouble.

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正确答案：A （备注：此答案有误）

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