问题
选择题
With the effects of global warming, trees their leaves much later in the year.
A．are losing
B．have lost
C．lost
D．were losing
答案
答案：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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