单项选择题

The search was ______ when the fog got thicker.

A. called off
B. called on
C. called in
D. called for
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单项选择题
You must ______ the facts and should not run away from the truth.
A. look
B. sight
C. front
D. face
单项选择题
Darkness doesn't trouble cats, for they can see ______.
A. in dark
B. in the dark
C. in a darkness
D. in darkness
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