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
网友回答
(答案→)A. are losing
B. have lost
C. lost
D. were losing
解析：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。