题目：
单选题
It is generally agreed that Sheik Ahmed Zaki Yamani was （ ）. (Sheik Yamani, Former Oil Minister of Saudi Arabia)
- Aa knowledgeable linguist in the 1970s
- Ba clever designer for the oil policy of the Arab world
- Can unproclaimed master of the Arab world
- Da natural diplomat who helped to strengthen the power of the Arab countries in the world
答案：
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