The flashing red light served as a________of danger ahead.

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问题 The flashing red light served as a________of danger ahead.

选项 A、predictor
B、caution
C、precaution
D、prevention

答案B

解析 A. predictor预测器，预报仪器。B．caution谨慎，警告。C．precaution预防措施或方法。D．prevention预防，妨碍。

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考博英语

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