There is no doubt that hiking is good for the retired couple,butit remains to be seen whether they will enjoy it.句中哪个是逻辑

There is no doubt that hiking is good for the retired couple,butit remains to be seen whether they will enjoy it.句中哪个是逻辑主语?
英语人气:143 ℃时间:2020-03-28 17:56:48
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that 后面的部分
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