单项选择题

Meanwhile, I always kept in touch with my former professor at college.

A．kept in contact with
B．kept pace with
C．had an idea of
D．exchanged letters with
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单项选择题
Some people prefer to remain anonymous when they call the police to report a crime.
A．undisturbed
B．unnoticed
C．unrecorded
D．unnamed
单项选择题
The landscape can change abruptly after a rainstorm in the desert in Xinjiang.
A．sharply
B．suddenly
C．favorably
D．slightly
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