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

There are flowers on（）side of the street.

A．both
B．either
C．two
D．another

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

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