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
单项选择题
Don't shout in the meeting room, ______.
A．should you
B．will you
C．can you
D．could you
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