单项选择题

A．Professors are responsible for the cleaning work.
B．Professors are responsible for reminding students to behave well.
C．It is unusual that the lecture hall is mess.
D．Students are thoughtless
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单项选择题
A．He should send the package third class.B．He should send the package first class.C．He can save his money.D．The first class mail is expensive.
A．He should send the package third class.
B．He should send the package first class.
C．He can save his money.
D．The first class mail is expensive.
单项选择题
A．Because she could play computer games.B．Because she could play online games.C．Because she could become ever richer.D．Because she could become a computer programmer.
A．Because she could play computer games.
B．Because she could play online games.
C．Because she could become ever richer.
D．Because she could become a computer programmer.
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