( ) 7.____ useful invention the computer is!A.What a B.What an C.How a D.How an

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( ) 7.____ useful invention the computer is!A.What a B.What an C.How a D.How an
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( ) 7.____ useful invention the computer is!A.What a B.What an C.How a D.How an
( ) 7.____ useful invention the computer is!A.What a B.What an C.How a D.How an

( ) 7.____ useful invention the computer is!A.What a B.What an C.How a D.How an
两个考点
第一,感叹句,判定what 和 how
how + adj.+主语+谓语
what + n.+主语+谓语
useful invention （有用的发明）是一个词组,从语句和语义判断,都是名词词组,应该选择what.（注意：不能单纯因useful是形容词就想到用how）
第二,useful是否为元音开头
useful的音标为[`ju:sful],第一音标不是元音,所以用a.
综上,判断应该选A

A ，因为useful 不是元音开头，invention是名词则用 what
如果 为形容词 例如 how beautiful she is！

B 感叹句且invention可数

选b感叹句，useful是元音音素u开头的要用an,whatan作宾语

C useful以元音字母开头 用an how + adj+主语+谓语

感叹句
a

A
感叹句形式有两类：what 和 how how + adj. +主语+谓语 what + n. +主语+谓语
其中的useful的音标为 [ˈjusf(ə)l]，不是以元音开头的，用an的条件是名词以 A E I O U 开头，然后是其音标也是以元音字母开头

选A。how在感叹句中是用来修饰形容词，而what感叹句中是用来修饰名词，此句子useful修饰invention，而useful中的u的英标为/ju;/,不为辅音字母，故选A。
愿采纳

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