21.一Is book on the desk useful one?一No, it isn’t. A.the,an B.the,a C.a(chǎn),the D.the,the 查看更多

 

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一Is ______ book on the desk ______ useful one?

一No, it isn’t.

A.the;an        B.the;a           C.a(chǎn);the        D.the;the

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