单项选择题
More than ten percent of the workers ______ from Italy.
A．is
B．comes
C．was
D．are
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单项选择题
Mary saw her son ______ the piano when she came to the room.
A．playing
B．play
C．played
D．to play
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单项选择题
As soon as you sat down, you fell asleep. I realized how ______.
A．tired you were
B．were you tired
C．you were tired
D．tired were you
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