The traffic rule says young children under the age of 4 and______less than 40 pounds must be in a child safety seat.

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问题 The traffic rule says young children under the age of 4 and______less than 40 pounds must be in a child safety seat.

选项 A、being weighed
B、weighs
C、weighed
D、weighing

答案D

解析 本题考查非谓语动词。非谓语动词包含现在分词、过去分词和不定式三种形式。现在分词用于表达主动或者动作正在进行,过去分词用于表达被动或已经完成,不定式通常表示目的或将来。分析句子结构可知,weigh与题干中的名词children是主动关系,因此应该用现在分词,故D)为本题答案。
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