The traffic rule says young children under age four and______less that 40 pounds must be in a child safety seat.

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问题 The traffic rule says young children under age four and______less that 40 pounds must be in a child safety seat.

选项 A、being weighed
B、to weigh
C、weighed
D、weighing

答案D

解析 young children和weigh构成主谓关系,所以排除A项和C项。不定式表示目的,应用现在分词作定语。故选D。
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