The student asked the librarian for help because he couldn’t find the book he (need)______.

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问题 The student asked the librarian for help because he couldn’t find the book he (need)______.

选项

答案needed

解析 本题考查定语从句的用法。he needed做book的定语,所以空格处填needed。本句是一个含有原因状语从句的主从复合句,在原因状语从句中又含有一个省略了that的定语从句修饰前面的先行词book。定语从句的时态由其主句“he couldn’t find the book”所在句子决定,应使用过去时。因此,空格处应该填needed。
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