单项选择题

A．Being unable to communicate face to face with others.
B．Having exams and tests.
C．Phone calls are expensive.
D．Professors are tough.
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单项选择题
A．Because it’s shining.B．Because it’s rare.C．Because it’s expensive.D．Because it came from ancient times.
A．Because it’s shining.
B．Because it’s rare.
C．Because it’s expensive.
D．Because it came from ancient times.
单项选择题
A．Grade all the homework.B．Clean the professor’s office.C．Help the professor in the classroom.D．Sort all the documents.
A．Grade all the homework.
B．Clean the professor’s office.
C．Help the professor in the classroom.
D．Sort all the documents.
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