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To our delight, up till now, the European Union, Japan, and Russia ________ their targets for CO2 emissions (排放).
A.giveB.have givenC.giveD.gave
B
考查时态。句意“让我们高兴的是,直到现在,欧盟、日本和俄罗斯已经制定了二氧化碳排放的目标。”up till now相当于so far,与现在完成时连用。故选B。
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