21.---He has got idea.He lets his sister go with him. ---That’s good idea. A.a,an B.a,a C.an,a D.an,an 查看更多

 

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---He has got ________ idea.He lets his sister go with him.

---That’s ________ good idea.

A.a;an              B.a;a                C.an;a                 D.an;an

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