单项选择题

You can go swimming ______ condition that you do not go far from the river bank.

A．on
B．in
C．under
D．with
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单项选择题
It was essential that he ______ the contract before the end of the week.
A．sign
B．would sign
C．signed
D．could sign
单项选择题
The murderer was brought in, with his hands ______ behind his back.
A．being tied
B．having tied
C．to be tied
D．tied
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