单项选择题


A．uninteresting
B．boring
C．abstract
D．humorous
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单项选择题
A．demonstrateB．strengthenC．promoteD．cultivate
A．demonstrate
B．strengthen
C．promote
D．cultivate
单项选择题
A．sinceB．becauseC．thoughD．however
A．since
B．because
C．though
D．however
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