Don't drop ____ on the floor.Please pick it up.A water B paper C books D bottles
问题描述：
Don't drop ____ on the floor.Please pick it up.A water B paper C books D bottles
答
B paper求解析因为后面是it，所以，排除了C books 、D bottles，因为他们是复数；water不能说 drop _water___ on the floor“将水扔在地板上”。所以，应该选择B。