单项选择题

______ by the police, the kidnappers had no choice but to surrender.

A．Surrounded
B．To be surrounded
C．Surrounding
D．Having surrounded
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单项选择题
Having waited in the waiting room for two hours, he became ______.
A．patient
B．impatient
C．patience
D．impatience
单项选择题
The trading company requires that payment ______ on time.
A．is made
B．was made
C．make
D．be made
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