2. 外语
  3. The elementary school students have a______understanding of fractions; some days they comprehend the math concepts, but other da

The elementary school students have a______understanding of fractions; some days they comprehend the math concepts, but other da

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问题 The elementary school students have a______understanding of fractions; some days they comprehend the math concepts, but other days they seem not to grasp them at all.
选项 A、formidable
B、conducive
C、clear
D、tenuous
E、questionable
答案D,E
解析 The best answer is D and E. The words that best fit in the blank are defined by the information the follows the semicolon. Tenuous means "unsubstantial or vague," so it, along with questionable, is the best choice.
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