单项选择题

The cloth should be put on the cupboard to（）the dust.

A、 keep out
B、 prevent from
C、 protect for
D、 leave off

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单项选择题
The villagers spent a whole night（）the missing child.

A、 searching for
B、 seeking after
C、 looking around
D、 finding out
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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