--_________ useful invention the computer is.
--Yes, It helps us a lot.

A．What an B．What a
C．How D．How a

B

解析試題分析：句意：計算機是多么有用的發(fā)明啊。是的，它幫助我們很多事情。what/how引導感嘆句時，what后接名詞，how后接形容詞和副詞；Invention發(fā)明，名詞；useful的首音標為輔音，故選B.
考點：考查感嘆句

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