单项选择题

It's quite late now and Mr. White _______ hasn't left his office.

A．still
B．already
C．since
D．yet
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单项选择题
Anna refused to ______ the car keys to her husband until he had promised to wear his satiety belt.
A．hand in
B．hand out
C．hand down
D．hand over
单项选择题
From the top of the building, we can see the bridge _______ construction.
A．by
B．in
C．under
D．below
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