单项选择题


A．though
B．because
C．so
D．however
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单项选择题
A．difficultB．sameC．interestingD．different
A．difficult
B．same
C．interesting
D．different
单项选择题
A．cooperateB．complainC．compromiseD．compare
A．cooperate
B．complain
C．compromise
D．compare
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