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

游客2023-09-25 50

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；又因为主语是单数，所以用is/was designed。

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