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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