At the turn of the twentieth century, forest covering as much as 90 percent of Thailand and accommodating as many as 300,000 alaphants, a third of them domesticated and performing various essential tasks. (A)covering as much as 90 percent of Thailand and accommodating as many as 300,000 alaphants, a third of them (D)covered as much as 90 percent of Thailand and accommodated as many as 300,000 e;ephants, a third of them 答案是(D) 想请问为什么不是A 谢谢 | 
