Problems _____ because they were lack of communication.
A．raisedB．roseC．a(chǎn)roseD．a(chǎn)roused
C
    A. 提高；舉起   B. 上升；增加   C.不及物動詞，出現(xiàn)；引發(fā) D.及物動詞引起；不及物動詞，激發(fā)。句意：因為他們?nèi)鄙俳涣�，問題出現(xiàn)了。故選C。
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