He came to know that the knowledge from books can be useful only _____ it is linked with practice.

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问题 He came to know that the knowledge from books can be useful only _____ it is linked with practice.

选项 A、as
B、when
C、while
D、for

答案B

解析

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专业英语四级

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He came to know that the knowledge from books can be useful only _____ it is linked with practice.

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