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