单项选择题

A dark cloud is a ______ of rain.

A．mark
B．signal
C．sign
D．symbol
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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
单项选择题
Having waited in the waiting room for two hours, he became ______.
A．patient
B．impatient
C．patience
D．impatience
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