单项选择题

Which floor is the flat on（）

A．On the first floor.
B．On the second floor.
C．On the third floor.
D．On the fourth floor.

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单项选择题
Where did the conversation most probably take place（）

A．In a court room.
B．At a department store.
C．At the customs.
D．At an insurance company.
填空题
It is often difficult to decide who really deserves the credit for (invent) （） a new device.
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