__book on the desk is __useful one A .The;an B.A;a C.The;a D.The;/

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__book on the desk is __useful one A .The;an B.A;a C.The;a D.The;/

__book on the desk is __useful one A .The;an B.A;a C.The;a D.The;/
__book on the desk is __useful one A .The;an B.A;a C.The;a D.The;/

__book on the desk is __useful one A .The;an B.A;a C.The;a D.The;/
C
the book 特指桌子上的那本书,用the
a useful one 泛指一本有用的书,用a

A

C

选C。The book特指在桌子上的书,用定冠词the
而useful看起来是元音"u"开头,但是"u"的发音是 [ju:] ,用“a”或者“an”是由发音决定的。

选a The book 特指“桌上那本书”
用a, 因为useful发音时 /ju:

第一空选The,因为后面给出了特定范围on the desk, 是特指。后半句选a,因为useful 的发音是[ j ]不是元音开头的单词,所以选C。