单项选择题

Iron and steel are flexible. But they are not as flexible ______ rubber.

A．as
B．to
C．for
D．by
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单项选择题
His fellow workers saw him fall down and blood came out from the open ______.
A．wound
B．hurt
C．injury
D．damage
单项选择题
I have been working for nearly 8 hours. I ______ at four o'clock.
A．was leaving
B．left
C．have left
D．am leaving
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