Billy was the youngest boy on the hike but hewith the others.A. kept upB. turned upC. cau

问题补充：

Billy was the youngest boy on the hike, but hewith the others.

A. kept up

B. turned up

C. caught up

D. drew up

答案：

(答案→)A. kept up

B. turned up

C. caught up

D. drew up

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