A red flag was placed there as a token of danger.A:sign B:substitute C:proof D:t

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问题 A red flag was placed there as a token of danger.

选项 A:sign
B:substitute
C:proof
D:target

答案A

解析本句意思:那儿放了一面红旗作为危险的象征。token表示,象征。sign标记,符号,征 兆;substitute代用品,代替者,替代品;proof证据,证明;target目标,对象。
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