单项选择题

The old man asked the young sailor if he had ever been （） in a dense fog.

A．by sea
B．in the sea
C．at sea
D．on the sea

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单项选择题
If Tom had enough money and time. He（）on a trip to Beijing.

A．should go
B．would go
C．perhaps went
D．had probably gone
单项选择题
The point （） water boils is called boiling point.

A．when
B．that
C．at which
D．for
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