2. 外语
  3. Jane has to become______at mathematics to be successful as an engineer.

Jane has to become______at mathematics to be successful as an engineer.

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问题 Jane has to become______at mathematics to be successful as an engineer.
选项 A、experienced
B、outstanding
C、prominent
D、proficient
答案D
解析 A项意为“有经验的，老练的”；B项意为“杰出的，未解决的”；C项意为“杰出的，显著的”；D项意为“精通的，熟练的”。本句意为简要成为成功的工程师，就必须精通数学。be proficient at意为“精通于”，D项符合题意。
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