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

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

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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；又因为主语是单数，所以用is／was designed。

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Everyexerciseinthebook(design)______tobuildupyourreasoningskills.is／wa