A lot of questions _________ at the meeting, which made things more plicated(复杂的).A.came acrossB.came up withC.came upD.came in
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C解析考查词组辨析，came across遇到，came up with及物动词短语，想出，提出came up不及物动词词组，被想出，被提出，came in进来，分析句子可知，很多问题在会议上被提出，这使得情况更糟糕。需要不及物动词词组。故选C。