Only when he knows the result of the exam______know to study hard.

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问题 Only when he knows the result of the exam______know to study hard.

选项 A、he does
B、does he
C、he did
D、did he

答案B

解析句意：只有当他知道了考试结果，他才知道要努力学习。only与副词、介词短语或状语从句搭配用于句首时，句子通常要用倒装语序(一般疑问句形式)。此题根据句子时态，应用does he。所以本题的答案选B。

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