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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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 company deferred him ______ on leave.
A．to be
B．to being
C．of being
D．from being
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