With the effects of global warming, trees          their leaves much later in the year.
A．a(chǎn)re losingB．have lostC．lostD．were losing
A
考查時(shí)態(tài)，指現(xiàn)階段一直進(jìn)行的動(dòng)作用現(xiàn)在進(jìn)行時(shí)態(tài)。句意：隨著全球變暖的影響，在一年中一些樹(shù)失去樹(shù)葉比以前晚多了。故選A。
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