only+状语（副词、介词短语、状语从句等等）置于句首时，主句才倒装。如：Only in this way can we succeed. 只有这样，我们才能成功。Only when agriculture is fully developed can industry have sufficient materials and markets. 只有农业发展了，工业才有足够的原料和市场。Only yesterday did I hear the news. 我昨天才听到这一消息。He was rescued only when an exhausted friend swam ashore. 当一个精疲力尽的友人游上岸后他才获救。
标签：从句,主句,倒装
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