it代指旅游这件事，和后面的主语是被动关系，所以用to be done
Having a trip abroad is certainly good for the old couple ,b
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英语翻译Having a trip abroad is certainly good for the old coupl
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帮我会答下6,having a trip is certainly good for the old couple ,b
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分析英语句子Having atrip abroad is certainly goodfor the old coupl
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