单项选择题

The teacher came into the room, with his hands ______ behind his back.

A．being crossed
B．having crossed
C．crossed
D．to be crossed
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单项选择题
Taking more exercise will prevent you ______ weight.
A．to put up
B．putting up
C．to put on
D．putting on
单项选择题
Now, she is upstairs ______ a long speech for the president.
A．preparing
B．was preparing
C．prepared
D．to prepare
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