This question examines the understanding of grammatical structures and their appropriate usage in a sentence. - A. passive voice is used when the subject of the sentence is the recipient of the action, but the sentence structure here does not indicate this. - B. virtual语气 does not exist in English grammar; it seems to be a confusion with 'virtual mood' which is not a standard term. - C. inverted sentence structure typically occurs in questions or in sentences that begin with adverbs of manner, but this is not the case in the given sentence. - D. subjunctive mood is used to express wishes, hypothetical situations, or actions that are not currently happening, which fits the context of the sentence as it describes a situation that was avoided. The correct answer is D. subjunctive mood, as it is the structure used to describe a hypothetical situation that was avoided by stopping the car.