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学英语的人对When-词并不觉得陌生,但when有一用法却很特殊且多数词典均未涉及。请看下列句子: 1.I was thinking of this when I heard my name called. 2.He was just about to dive when he saw the shark. 3.I was watching the television,when suddenly the lights went out. 4.One evening little Hans was sit