单项选择题

A．It went out of use 300 years ago.
B．It was invented after the short bow.
C．It was discovered before fire and the wheel.
D．It’s still in use today.
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单项选择题
A．Professionals.B．College students.C．Beginners.D．Intermediate earners.
A．Professionals.
B．College students.
C．Beginners.
D．Intermediate earners.
单项选择题
A．The woman has trouble getting along with the professor.B．The woman regrets having taken up much of the professor’s time.C．The woman knows the professor has been busy.D．The woman knows the professor has run into trouble.
A．The woman has trouble getting along with the professor.
B．The woman regrets having taken up much of the professor’s time.
C．The woman knows the professor has been busy.
D．The woman knows the professor has run into trouble.
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