17．--What's behind door? I can't open it．--Let me see．Oh, there is chair．A．the, a B．a ,the C．a, a D．the, the 【查看更多】

 

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一What's behind          door? I can't open it．   
一Let me see．Oh,there's a chair．  
A．aB．anC．the D．／

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“What's behind ________ door? I can't open it.”

“Let me see. Oh, there's a chair.”

[　　]

A．a
B．an
C．the
D．不填

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