题目

He was employed in          those animals, all of          homes had been destroyed by humans.   A. help; whichB. helping; whom C. help; whoseD. helping; whose 答案：D某商店把一商品按标价的九折出售（即优惠10%），仍可获利20%，若该商品的标价为每件28元，则该商品的进价为（ ）. A．21元　　B．19.8元　　 C．22.4元　　D．25.2元