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
Most lecturers find it expedient to use notes when addressing to graduate students.
A．troublesome
B．expensive
C．useful
D．improper
单项选择题
In most high schools, boys and girls attend the same classes, except in health education, where they are segregated.
A．classified
B．organized
C．decomposed
D．separated
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