2. 外语
  3. Every exercise in the book (design)______ to build up your reasoning skills.

Every exercise in the book (design)______ to build up your reasoning skills.

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问题 Every exercise in the book (design)______ to build up your reasoning skills.
选项
答案is/was designed
解析 本题考查动词被动语态的用法。动词design和主语every exercise之间是被动关系，所以需要用动词的被动式be designed；又因为主语是早数，所以用is/was designed。
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