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I
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C
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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.
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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