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With the effects of global warming, trees          their leaves much later in the year.
A.are losingB.have lostC.lostD.were losing
A
考查时态,指现阶段一直进行的动作用现在进行时态。句意:随着全球变暖的影响,在一年中一些树失去树叶比以前晚多了。故选A。
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