单项选择题

His inability to learn foreign languages was a(n) obstacle to his career.()

A. barrier
B. excess
C. carrier
D. impulse

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单项选择题
Experience leads me to think that it is not always good to get () with strangers.

A. tolerant
B. confidential
C. enthusiastic
D. agreeable
单项选择题
The word inhibited most nearly means ().

A. friendly
B. polite
C. afraid
D. restrained
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