摘要： -What's behind door? I can't open it. -Let me see. Oh, there's a chair. A. a B. an C. the D. /

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---“What's behind ________ door? I can't open it.”
---“Let me see. Oh, there's a chair.”

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

“Let me see. Oh, there's a chair.”

[　　]

[ ]

A. the ; a
B. a; the
C. a; a
D. the ; the

---“What's behind ________ door? I can't open it.”---“Let me see. Oh, there's a chair.”