16 When travelling, tourists should stay ______ in big cities and keep themselves protected from crime.
(A) irrelevant
(B) outrageous
(C) clinical
(D) vigilant

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統計: A(1), B(2), C(4), D(18), E(0) #2995983

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#6345182
✅ 正確答案: (D) vigilan...
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