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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单项选择题
The trading company requires that payment ______ on time.
A．is made
B．was made
C．make
D．be made
单项选择题
______ at the launching position a lift took him up to the rocket, which was 65 feet above the ground.
A．While arriving
B．Having arrived
C．When he arrived
D．On his arrival
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