单项选择题

A．To chat with Jack.
B．To get help in the course.
C．To hand in their assignments.
D．To practise giving interviews.
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单项选择题
A．They are unconquerable obstacles.B．They do not exist.C．They are challenges to improve the city life.D．They are exciting and interesting.
A．They are unconquerable obstacles.
B．They do not exist.
C．They are challenges to improve the city life.
D．They are exciting and interesting.
填空题
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