问题
选择题
In freezing weather, snow can turn into ice, which is easy to ________.
A．be slipped
B．slip
C．slip on
D．be slipping
答案
答案：C
C [slip是不及物动词，需要加相应的介词。]
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In freezing weather, snow can turn into ice, which is easy to ________.
A．be slipped
B．slip
C．slip on
D．be slipping
答案：C
C [slip是不及物动词，需要加相应的介词。]