题目内容
---Lin Too, open _______door, please.
---I’ m coming, Mum.
| A．the | B．an | C．a | D．/ |
A
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---Lin Too, open _______door, please.
---I' m coming, Mum.
---I' m coming, Mum.
| A．the | B．an | C．a | D．/ |