This only makes sense in context. There is a sentence before this one. Take a look at that sentence and the meaning will be clear.
in case of = preposition 前置词, and is used exactly like any preposition.
13 avril 2011
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"I must, in case of her impromptu bursts of tears." 'Impromptu' can be an adverb or adjective, but never a noun. It cannot become plural. :)
13 avril 2011
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