单选题
They found it hard to understand that Tom who had once strongly detested pet dogs could be so engrossed in pet raising these days.无
【正确答案】
B
【答案解析】句意：汤姆曾经一度非常讨厌宠物狗， 现在却对宠物的饲养十分痴迷， 这让他们很难理解。 engrossed in埋头于， 热衷于。absorbed in专心； 热衷于……。 destitute穷困的； 无的。