单项选择题

A．Dr. Martin didn’t want so many students in his class.
B．The students were supposed to buy the textbook earlier.
C．The bookstore is going out of business.
D．Dr. Martin didn’t order enough textbooks for his students.
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单项选择题
A．He is fired of using his new computer.B．He has just assembled the computer.C．He has used his new computer for writing his dissertation.D．He has found something wrong with the new computer.
A．He is fired of using his new computer.
B．He has just assembled the computer.
C．He has used his new computer for writing his dissertation.
D．He has found something wrong with the new computer.
单项选择题
A．He can not make a copy because of the copyright.B．He can make his own copy.C．He should wait until tomorrow.D．He can not make a copy now.
A．He can not make a copy because of the copyright.
B．He can make his own copy.
C．He should wait until tomorrow.
D．He can not make a copy now.
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