题目内容
They must have gotten to the top of the mountain by now. They_____ before the sun rose.
A. settled downB. set out C. took off D. turned up
B
【解析】
试题分析:A. settled down定居下来,安静下来,B. set out出发,动身,C. took off脱下,起飞,D. turned up[出现,露面,句意:现在他们一定到了山顶,他们在太阳升起前出发的。所以选B。
考点:考查动词短语
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