单项选择题

Owls usually prey ______ mice and snakes.

A．by
B．on
C．to
D．in
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单项选择题
A baby might show fear of an unfamiliar adult, ______ he is likely to smile and reach out to another infant.
A．so that
B．if
C．whenever
D．whereas
单项选择题
The temperature ______ below zero last night because the water is frozen all over.
A．had dropped
B．must have dropped
C．would have dropped
D．must drop
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