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Wehavehadatelephonemessagefromyourfatherusthathewasonthetrain.为什么空格处用"telling"而加上"that"之后又变成"told"了呢?这和动名词作主语有关吗?请用语法知识回答,

题目详情
We have had a telephone message from your father ___ us that he was on the train.
为什么空格处用"telling "而加上"that"之后又变成"told"了呢?这和动名词作主语有关吗?请用语法知识回答,
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答案和解析
这是分词短语作后置定语,修饰a telephone message 的
等于:which/ that told us that he was on the train.定语从句
因为这时它们的用法交差了,都一样,所以可互换