问题
选择题
Only when he saw the test paper himself, ______ he had failed in the exam again.
A．he believed
B．he had belived
C．did he believe
D．had he believe
答案
答案：C
题目分析：考查only+时间状语从句，后面的主句用部分倒装，句意：只有当他看见考试卷，他才相信考试有没及格。可知要用过去时，选C。
点评; only的倒装句要注意一定是only后面接状语才能倒装，如果接主语或宾语就不是倒装句了。