单项选择题


A．when
B．if
C．unless
D．while
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单项选择题
A．thoughB．whereasC．howeverD．because
A．though
B．whereas
C．however
D．because
单项选择题
A．difficultB．complicatedC．modernD．well-known
A．difficult
B．complicated
C．modern
D．well-known
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