It is not surprising, then,that the world saw a return to a floating exchange rate system. Central banks were no longer required to support their own currencies.

It is not surprising, then,that the world saw a return to a floating exchange rate system. Central banks were no longer required to support their own currencies.

A.在这种情况下，世界各国又恢复浮动汇率就不足为奇了。各国中央银行也就无须维持本币的汇价了。

B.不足为奇，全世界看到了汇率的回归，因此各国中央银行无需维持本币的汇价了。

C.此时此刻，世界各国又恢复了移动的交换比率，因此各国中央银行无需维持本币汇价。

D.在这种情况下，全世界又恢复了浮动交换率，这已不足为奇了，因此各国中央银行也就无需维持本币价格了。

正确答案是A