e careful只是一个简单的词组,小心的意思,后面如果加宾语的话,必须要加个介词,才能接宾语.
look out是一个不及物词组,后面如果要加宾语,也是需要一个介词的
三个选项,只有mind是及物动词
所以选c
Please ( ) the steps as you go in .A.be careful.B.look out.C
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