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
We should not be too（）our parents in many ways.

A、 dependent to
B、 independent at
C、 dependent on
D、 independent on
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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