单项选择题

I tried to call you lost night but your line was______.

A．occupied
B．taken
C．connected
D．engaged
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单项选择题
Jones had audaciously slapped my face, and that I had been obliged to ______ against him by knocking him down.
A．revenge
B．avenge
C．reward
D．retaliate
单项选择题
Since Xerox couldn't work smoothly, he assumed that someone had ______ with it.
A．scampered
B．pampered
C．hampered
D．tampered
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