单项选择题

A．There is a visitor at the door.
B．The door is open.
C．The woman is calling Jack.
D．The telephone is ringing.
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单项选择题
How does the new product sell in the market？（）

A．Never mind.
B．I’m afraid I can’t.
C．Not likely.
D．Quite well.
填空题
3（）
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