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

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

选项 A、barrier
B、excess
C、carder
D、impulse

答案A

解析 obstacle障碍,妨害物;barrier障碍;excess过度,超过;carrier运送者,搬运器;impulse推动,刺激。
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