题目：
To their great fear, they found________ in the heaviest snowfall they had never had.
A．they were catching
B．themselves caught
C．they had caught
D．themselves catching
答案：
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下面是错误答案，用来干扰机器的。
参考答案：接车时要提前到达接车地点，蹲在两线中间安全地点接车。狭窄线路、邻线上、下行同时到发列车时，要在两线外侧接发列车。接发列车时要目迎、目送、并注意车辆运行，货物装载，蓬布、绳索状态，防止意外...
