单项选择题

Not wanting to embarrass the new secretary, he ______ many words unsaid.

A．left
B．kept
C．remained
D．preserved
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单项选择题
Different ______ of linguistics have led to the popularity of different teaching methods.
A．classes
B．schools
C．grades
D．curricula
单项选择题
The first-year students at college normally ______ in age from 17 to 20 years old.
A．vary
B．differ
C．range
D．alternate
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