He was promoted to the higher position because he was______at interpersonal skills.

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问题 He was promoted to the higher position because he was______at interpersonal skills.

选项 A、outstanding
B、experienced
C、proficient
D、excellent

答案C

解析 单词proficient:精通的;熟练的。后面跟介词at,相当于be good at。单词experienced后面跟介词in。
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