单项选择题

A) Professor and student. C) Boss and secretary.
B) Employer and employee. D) They met for the first time.
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单项选择题
A) Very often. C) Go to English class. B) Twice a week. D) In the teaching building.
A) Very often. C) Go to English class.
B) Twice a week. D) In the teaching building.
单项选择题
Thus the difficulties of exchange led by degrees to the invention of money.
A)这样，交换的困难在某种程度引起了钱的出现。
B)这样，钱的出现在某种程度上引起厂交换的困难。
C)这样，交换导致某种程度上的困难，引起了钱的出现。
D)这样，交换的困难在不同程度上引起了钱的出现。
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