Choose C
首先,可以很容易的排出A和D, 因为他们都是介词of结尾,后面不能跟句子.
然后,看B. occasion 后面应该是定语从句,可是少了where,所以排除.
最后锁定C. C的意思是 一旦/以防
自己翻一下句子就可以了,呵呵!
Call us __ you meet with any difficulties.
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