问题
选择题
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
答案
答案：D
此处weigh为“重量为；重(多少)”的意思，作young children的后置定语，且与其关系为主动，用weighing，故D项正确。句意为：交通规则规定四岁以下并且体重少于40磅的儿童必须放于儿童安全座椅上。