Under no circumstances______without looking carefully to the rear.

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问题 Under no circumstances______without looking carefully to the rear.

选项 A、should one back up a motor vehicle
B、a motor vehicle should back up
C、one should back up a motor vehicle
D、should back up a motor vehicle

答案A

解析 After the introductory negative under no circumstances, the subject and verb are inverted: should one back up a motor vehicle.

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托福（TOEFL）

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