The fire-fighter organization has over 1,000 volunteers who are extensively trained and mostly ___.
Aunidentified
Bundoubted
Cunknown
Dunpaid正確答案
答案與詳解
unpaid 意為「無給職的、未支薪的」,正好是 volunteer(志工)的核心特徵:受過訓練但不支薪。
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