用when或while都行（因为连接的是进行时态）
但一定要有连词
用while表“...的时候”时后面一定是进行时
while还可以表示“而”表示对比关系,此时后面不一定要用进行时
可以这样改句子吗3 When he arrived I was working in the garden.4 When
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