30.This meeting room is a non-smoking area. I would like to warn you _____ that if you smoked here you would be fined.
句意：这个会议室是无烟区，我想提前警告你，如果你在这抽烟的话你将会
被罚款。A项“提前”；B项“详细地”；C项“总的”；D项“一般，大体”。故选A项。
从后半句if you smoked here you would be fined. “如果你在这抽烟你会被罚款”，应该是提前警告。。
介词短语区分不当容易错选B