______on one subject, you should by no means feel like studying another one.A、Wh

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问题 ______on one subject, you should by no means feel like studying another one.

选项 A、When you working
B、When working
C、When worked
D、When you works

答案 B

解析 (A)和(D)的动词形式不正确，将选项(A)和(D)改为when you work也是正确的；(C)缺少主语。

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