单项选择题

A．Half a year.
B．Four or five years.
C．Three years.
D．One year.
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单项选择题
Some students don’’t feel comfortable when calling a teacher on the telephone if they need help.
A．Y
B．N
C．NG
单项选择题
A．At the beginning of a semester.B．During midterm week.C．At the end of a semester.D．In the middle of summer vacation.
A．At the beginning of a semester.
B．During midterm week.
C．At the end of a semester.
D．In the middle of summer vacation.
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