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?
參考答案:that 后面的部分
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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?
參考答案:that 后面的部分