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 (rudimentary基本的，初步的)。句意为，他无法清楚地解释这个问题，因为他对这门课只有初步的了解。A．elementary初级的；C．inceptive开始的；D．initial最初的，开始的。
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