单项选择题

The train from Shanghai is pulling ______.

A．in
B．out
C．off
D．back
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单项选择题
This was a piece of news of great importance to every man and woman who ______ waiting anxiously outside the building.
A．were
B．has been
C．have been
D．was
单项选择题
Iron and steel expands when heated and ______ when cooled.
A．shrinks
B．contracts
C．condenses
D．compresses
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