4.It is generally agreed that Sheik Ahmed Zaki Yamani was ______. (Sheik Yamani, Former Oil Minister of Saudi Arabia)
A)a knowledgeable linguist in the 1970s
B)a clever designer for the oil policy of the Arab world
C)an unproclaimed master of the Arab world
D)a natural diplomat who helped to strengthen the power of the Arab countries in the world

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