题目内容：
The agreements that were reached at the Bretton Woods conference in 1944 established a system（ ）.
A．of essentially fixed exchange rates under which each country agreed to intervene in the for-eign exchange market when necessary to maintain the agreed-upon value of its currency B．of floating exchange rates determined by the supply and demand of one nation's currency relative to the currency of other nations
C．that prohibited governments from intervening in the foreign exchange markets
D．in which the values of currencies were fixed in terms of a specific number of ounces of gold,which in turn determined their values in international trading
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