首先纠正你个错误,是三单不是单三.全称第三人称单数.
第一个是把heating rooms and water 当主语了.
第二个你理解错了,主语是demand,不是 ovens, kettles and washing machines 这些东西.你可以先把 ovens, kettles and washing machines 看成X,主语是the demand of X.因此应该用三单.
第三个有一个陷阱在,后文中是the same,也就是电视和收音机都是15%.
英语语法……求大牛解答……Specifically,heating rooms and water accounts f
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