that will be 【 】 useful reference book in my researchthat will be 【 】 useful reference book in my research 括号里填什么

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that will be 【 】 useful reference book in my researchthat will be 【 】 useful reference book in my research 括号里填什么
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that will be 【 】 useful reference book in my researchthat will be 【 】 useful reference book in my research 括号里填什么
that will be 【 】 useful reference book in my research
that will be 【 】 useful reference book in my research 括号里填什么

that will be 【 】 useful reference book in my researchthat will be 【 】 useful reference book in my research 括号里填什么
a
a useful reference book 一本非常有用的参考书

答案：a
真正的理由：虽然useful的第一个字母为元音u，但是其发音不为元音，所以要用a。即：
useful [ˈju:sfl]，其发音为j，不是元音。所以冠词要用a，不能用an。
能理解吗？
请采纳，谢谢！

that will be the That will be all . That will be That will be all That will be 32 That -------(would ,will ) be great . that will be fun.要否答 What will that be like? it will be recalled that thisone will be that one That will be difficult是什么意思 That will be fun中的“be”是什么意思? I think that everyone will use computer.(改为否定句) It will be a good use of money.怎么翻译 People won't use money.Everything will be free. why use TELL ME WHYi think that will likely be the news ____ you write tomorrowA when B how C / D whether Will there be schooi in the future?No,there won't.I think that everyone will stud at home and will use computers.The'll use the Internet.And will they send their homwork to the teachers by email?Yes,they will.And students will talk to their teachers I suggest you_full installation so that all the dlls will be installed to the system root of yourcomputer.A use B using C to use D used该选什么要详解谢谢