单项选择题


A．contain
B．containing
C．contained
D．to contain
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单项选择题
A．takenB．derivedC．gotD．attained
A．taken
B．derived
C．got
D．attained
单项选择题
A．easyB．easierC．difficultD．difficulty
A．easy
B．easier
C．difficult
D．difficulty
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