单项选择题

A．How to drop a course.
B．The man needs advice about which classes to take.
C．How to get the approval of the professor.
D．How to add a course to the man’s schedule.
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单项选择题
A．He saw the big tower he visited on TV.B．He has visited the TV tower twice.C．He has visited the TV tower once.D．He will visit the TV tower in June.
A．He saw the big tower he visited on TV.
B．He has visited the TV tower twice.
C．He has visited the TV tower once.
D．He will visit the TV tower in June.
单项选择题
A．The purpose of laughter.B．The cause of laughter and its effects.C．Who and when people laugh.D．The origins of laughter.
A．The purpose of laughter.
B．The cause of laughter and its effects.
C．Who and when people laugh.
D．The origins of laughter.
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