A．Because they get low grades.B．Because they exhaust th-找考题网

单项选择题

A．Because they get low grades.
B．Because they exhaust the reference sources in the library.
C．Because they can spend only limited time with the professors.
D．Because their teachers do not grade every assignment of them.

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单项选择题

A．Take the class over again.B．Take the class this semester.C．Get permission to take the class.D．Register for the class next semester.

A．Take the class over again.
B．Take the class this semester.
C．Get permission to take the class.
D．Register for the class next semester.

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