The traffic rule says young children under the age of four and less than 40 pounds must be in a child safety seat.
A. being weighed
B. to weigh
C. weighed
D. weighing
网友回答
A. being weighed
B. to weigh
C. weighed
(答案→)D. weighing
解析：这题考查现在分词做定语的用法：可以看and前后并列，前面under the age of 4做young children 定语，后边也应该是做young children 定语。Weigh做为“重达”讲，是不及物动词，不用被动，用现在分词做定语，句意是：交通法规规定：4岁以下并且少于40磅的小孩必须坐在儿童安全坐位上。