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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