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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
考查時態(tài)。句意“讓我們高興的是，直到現(xiàn)在，歐盟、日本和俄羅斯已經制定了二氧化碳排放的目標�！眜p till now相當于so far，與現(xiàn)在完成時連用。故選B。
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