2. 外语
  3. He came to know that the knowledge from books can be useful only______it is linked with practice.

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 状语从句。as作连词时，一般意为“正当……时候”。while作连词时，一般连接的两个同时或几乎同时发生的动作。when意为“当……时候”，前加only是为强调，only when是一习惯组合。
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