单项选择题

A．According to
B．Among
C．Of
D．In
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单项选择题
A．difficultB．complicatedC．modernD．well-known
A．difficult
B．complicated
C．modern
D．well-known
单项选择题
A．thoughB．whereasC．howeverD．because
A．though
B．whereas
C．however
D．because
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