21．---He has got idea．He lets his sister go with him．---That’s good idea．A．a(chǎn),an B．a(chǎn),a C．a(chǎn)n,a D．a(chǎn)n,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(chǎn)；an              B．a(chǎn)；a                C．a(chǎn)n；a                 D．a(chǎn)n；an

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