问题描述:
It was 1988 when we first traveled to Europe = It was 1988 in which we first traveled to Europe =I
It was 1988 when we first traveled to Europe = It was 1988 in which we first traveled to Europe =It was 1988 which we first traveled to Europe in =It was 1988 we first traveled to Europe in .这里which为什么能省略的啊
It was 1988 when we first traveled to Europe = It was 1988 in which we first traveled to Europe =It was 1988 which we first traveled to Europe in =It was 1988 we first traveled to Europe in .这里which为什么能省略的啊
问题解答:
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