2. 外语
  3. He couldn’t explain the problem well, as he had only a(n)______knowledge of the subject.

He couldn’t explain the problem well, as he had only a(n)______knowledge of the subject.

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问题 He couldn’t explain the problem well, as he had only a(n)______knowledge of the subject.
选项 A、elementary
B、rudimentary
C、inceptive
D、initial
答案B
解析 四个选项的意思分别是：elementary初等，基础的；rudimentary根本的，未发展的；inceptive起初的，开端的；initial初始的，最初的。句意是，他无法很好地解释这个问题，因为他对这方面的知识知之甚少。所以正确答案是B选项，如：I have only a rudimentary grasp of chemistry．(我只掌握了化学的初步知识)。
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