单项选择题

He had always kept a ______ eye on what was happening around him.

A．clear
B．keen
C．distinct
D．sensitive
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单项选择题
You should take an umbrella with you ______ it rains.
A．in case
B．because
C．provided
D．if
单项选择题
Janet's close ______ to her younger sister often made people mistake them for each other.
A．relationship
B．relevance
C．resemblance
D．connection
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