When travelling, tourists should stay ___ in big cities and keep themselves protected from crime.
Airrelevant
Boutrageous
Cclinical
Dvigilant正確答案
答案與詳解
vigilant 意為「警覺的、警戒的」,常與 stay/remain/keep 搭配,表示對危險保持警戒,完全契合句意。
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